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Lesson 1: Blackbody Radiation, Max Planck Hypothesis and the Photon — Picture questions (exam style)

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  • Questions count: 98
  • Passing grade: 60%
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1.
A black body at 6000 K changes to 9000 K (curves shown). Which option is correct?
A black body at 6000 K changes to 9000 K (curves shown). Which option is correct?
λmax × 2/3, radiated power × 9/4
λmax × 2/3, radiated power × 81/16
λmax × 9/4, radiated power × 3/2
λmax × 4/9, radiated power × 81/16
2.
Source 1: 1 W at 700 nm; source 2: 1 W at 250 nm. (E = photon energy, N = photons per second.) Which option is correct?
Source 1: 1 W at 700 nm; source 2: 1 W at 250 nm. (E = photon energy, N = photons per second.) Which option is correct?
E₂ : E₁ = 25 : 196, N₁ : N₂ = 196 : 25
E₂ : E₁ = 28 : 5, N₁ : N₂ = 25 : 196
E₂ : E₁ = 196 : 25, N₁ : N₂ = 14 : 10
E₂ : E₁ = 14 : 5, N₁ : N₂ = 14 : 5
3.
A black sphere of radius 20.0 cm radiates 2.61×107 W. What is its surface temperature? (σ = 5.67×10−8 W m−2 K−4)
A black sphere of radius 20.0 cm radiates 2.61×10⁷ W. What is its surface temperature? (σ = 5.67×10⁻⁸ W m⁻² K⁻⁴)
6540 K
5500 K
2750 K
4630 K
4.
The graph shows black-body radiation at 5800 K. Find the wavelength of peak intensity (Wien constant 2.9×10−3 m K).
The graph shows black-body radiation at 5800 K. Find the wavelength of peak intensity (Wien constant 2.9×10⁻³ m K).
500 nm
250 nm
2.00×10−3 nm
16800 nm
5.
Source 1: 2 W at 450 nm; source 2: 1 W at 200 nm. (E = photon energy, N = photons per second.) Which option is correct?
Source 1: 2 W at 450 nm; source 2: 1 W at 200 nm. (E = photon energy, N = photons per second.) Which option is correct?
E₂ : E₁ = 9 : 4, N₁ : N₂ = 9 : 2
E₂ : E₁ = 9 : 4, N₁ : N₂ = 2 : 9
E₂ : E₁ = 18 : 4, N₁ : N₂ = 4 : 81
E₂ : E₁ = 18 : 4, N₁ : N₂ = 18 : 2
6.
A black body at 6000 K changes to 18000 K (curves shown). Which option is correct?
A black body at 6000 K changes to 18000 K (curves shown). Which option is correct?
λmax × 3, radiated power × 9
λmax × 1/3, radiated power × 81
λmax × 1/3, radiated power × 3
λmax × 1/9, radiated power × 81
7.
Source 1: 2 W at 700 nm; source 2: 5 W at 200 nm. (E = photon energy, N = photons per second.) Which option is correct?
Source 1: 2 W at 700 nm; source 2: 5 W at 200 nm. (E = photon energy, N = photons per second.) Which option is correct?
E₂ : E₁ = 14 : 2, N₁ : N₂ = 49 : 25
E₂ : E₁ = 2 : 7, N₁ : N₂ = 7 : 25
E₂ : E₁ = 14 : 2, N₁ : N₂ = 5 : 7
E₂ : E₁ = 7 : 2, N₁ : N₂ = 7 : 5
8.
The curves are for a black body at two temperatures. Curve 1 is at 6000 K. What is the temperature of curve 2? (use the peak positions)
The curves are for a black body at two temperatures. Curve 1 is at 6000 K. What is the temperature of curve 2? (use the peak positions)
4000 K
18000 K
2000 K
8000 K
9.
A black body at 6000 K changes to 3000 K (curves shown). Which option is correct?
A black body at 6000 K changes to 3000 K (curves shown). Which option is correct?
λmax × 1/2, radiated power × 1/8
λmax × 2, radiated power × 1/16
λmax × 4, radiated power × 1/8
λmax × 2, radiated power × 1/2
10.
Source 1: 5 W at 450 nm; source 2: 2 W at 350 nm. (E = photon energy, N = photons per second.) Which option is correct?
Source 1: 5 W at 450 nm; source 2: 2 W at 350 nm. (E = photon energy, N = photons per second.) Which option is correct?
E₂ : E₁ = 9 : 7, N₁ : N₂ = 45 : 196
E₂ : E₁ = 9 : 7, N₁ : N₂ = 45 : 14
E₂ : E₁ = 7 : 9, N₁ : N₂ = 45 : 196
E₂ : E₁ = 7 : 9, N₁ : N₂ = 45 : 14
11.
The graph shows black-body radiation at 5000 K. Find the wavelength of peak intensity (Wien constant 2.9×10−3 m K).
The graph shows black-body radiation at 5000 K. Find the wavelength of peak intensity (Wien constant 2.9×10⁻³ m K).
1.72×10−3 nm
14500 nm
580 nm
290 nm
12.
Source 1: 5 W at 450 nm; source 2: 1 W at 800 nm. (E = photon energy, N = photons per second.) Which option is correct?
Source 1: 5 W at 450 nm; source 2: 1 W at 800 nm. (E = photon energy, N = photons per second.) Which option is correct?
E₂ : E₁ = 9 : 16, N₁ : N₂ = 45 : 32
E₂ : E₁ = 9 : 16, N₁ : N₂ = 45 : 256
E₂ : E₁ = 9 : 16, N₁ : N₂ = 90 : 16
E₂ : E₁ = 9 : 16, N₁ : N₂ = 45 : 16
13.
The curves are for a black body at two temperatures. Curve 1 is at 10000 K. What is the temperature of curve 2? (use the peak positions)
The curves are for a black body at two temperatures. Curve 1 is at 10000 K. What is the temperature of curve 2? (use the peak positions)
2000 K
50000 K
6000 K
12000 K
14.
A black body at 4000 K changes to 6000 K (curves shown). Which option is correct?
A black body at 4000 K changes to 6000 K (curves shown). Which option is correct?
λmax × 3/2, radiated power × 9/4
λmax × 2/3, radiated power × 81/16
λmax × 4/9, radiated power × 3/2
λmax × 4/9, radiated power × 9/4
15.
Source 1: 2 W at 400 nm; source 2: 2 W at 350 nm. (E = photon energy, N = photons per second.) Which option is correct?
Source 1: 2 W at 400 nm; source 2: 2 W at 350 nm. (E = photon energy, N = photons per second.) Which option is correct?
E₂ : E₁ = 8 : 7, N₁ : N₂ = 8 : 7
E₂ : E₁ = 8 : 7, N₁ : N₂ = 8 : 49
E₂ : E₁ = 7 : 8, N₁ : N₂ = 8 : 7
E₂ : E₁ = 8 : 7, N₁ : N₂ = 64 : 49
16.
The graph shows black-body radiation at 6000 K. Find the wavelength of peak intensity (Wien constant 2.9×10−3 m K).
The graph shows black-body radiation at 6000 K. Find the wavelength of peak intensity (Wien constant 2.9×10⁻³ m K).
17400 nm
2.07×10−3 nm
483 nm
242 nm
17.
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 4000 K and 3000 K?
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 4000 K and 3000 K?
2.37
1.78
1.33
3.16
18.
A black body at 2000 K changes to 6000 K (curves shown). Which option is correct?
A black body at 2000 K changes to 6000 K (curves shown). Which option is correct?
λmax × 1/3, radiated power × 9
λmax × 1/3, radiated power × 81
λmax × 1/3, radiated power × 27
λmax × 1/9, radiated power × 3
19.
Source 1: 1 W at 700 nm; source 2: 2 W at 300 nm. (E = photon energy, N = photons per second.) Which option is correct?
Source 1: 1 W at 700 nm; source 2: 2 W at 300 nm. (E = photon energy, N = photons per second.) Which option is correct?
E₂ : E₁ = 49 : 9, N₁ : N₂ = 36 : 49
E₂ : E₁ = 7 : 3, N₁ : N₂ = 7 : 36
E₂ : E₁ = 49 : 9, N₁ : N₂ = 6 : 7
E₂ : E₁ = 7 : 3, N₁ : N₂ = 7 : 6
20.
The graph shows black-body radiation at 7000 K. Find the wavelength of peak intensity (Wien constant 2.9×10−3 m K).
The graph shows black-body radiation at 7000 K. Find the wavelength of peak intensity (Wien constant 2.9×10⁻³ m K).
2.41×10−3 nm
207 nm
20300 nm
414 nm
21.
A black body at 5000 K changes to 2500 K (curves shown). Which option is correct?
A black body at 5000 K changes to 2500 K (curves shown). Which option is correct?
λmax × 2, radiated power × 1/2
λmax × 2, radiated power × 1/4
λmax × 1/4, radiated power × 1/16
λmax × 2, radiated power × 1/16
22.
Source 1: 5 W at 500 nm; source 2: 5 W at 350 nm. (E = photon energy, N = photons per second.) Which option is correct?
Source 1: 5 W at 500 nm; source 2: 5 W at 350 nm. (E = photon energy, N = photons per second.) Which option is correct?
E₂ : E₁ = 7 : 10, N₁ : N₂ = 10 : 7
E₂ : E₁ = 49 : 100, N₁ : N₂ = 7 : 10
E₂ : E₁ = 10 : 7, N₁ : N₂ = 10 : 7
E₂ : E₁ = 100 : 49, N₁ : N₂ = 20 : 7
23.
A sphere of radius 5.00 cm behaves as a black body at 1000 K. Find the total power it radiates (σ = 5.67×10−8 W m−2 K−4).
A sphere of radius 5.00 cm behaves as a black body at 1000 K. Find the total power it radiates (σ = 5.67×10⁻⁸ W m⁻² K⁻⁴).
56700 W
1780 W
445 W
1.78×10−3 W
24.
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 12000 K and 3500 K?
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 12000 K and 3500 K?
11.8
40.3
138
3.43
25.
The curves are for a black body at two temperatures. Curve 1 is at 7000 K. What is the temperature of curve 2? (use the peak positions)
The curves are for a black body at two temperatures. Curve 1 is at 7000 K. What is the temperature of curve 2? (use the peak positions)
9500 K
4080 K
12000 K
19000 K
26.
Source 1: 2 W at 600 nm; source 2: 5 W at 200 nm. (E = photon energy, N = photons per second.) Which option is correct?
Source 1: 2 W at 600 nm; source 2: 5 W at 200 nm. (E = photon energy, N = photons per second.) Which option is correct?
E₂ : E₁ = 6 : 1, N₁ : N₂ = 12 : 5
E₂ : E₁ = 3 : 1, N₁ : N₂ = 6 : 25
E₂ : E₁ = 3 : 1, N₁ : N₂ = 6 : 5
E₂ : E₁ = 3 : 1, N₁ : N₂ = 5 : 6
27.
The graph shows black-body radiation at 3000 K. Find the wavelength of peak intensity (Wien constant 2.9×10−3 m K).
The graph shows black-body radiation at 3000 K. Find the wavelength of peak intensity (Wien constant 2.9×10⁻³ m K).
967 nm
1.03×10−3 nm
483 nm
8700 nm
28.
Source 1: 2 W at 600 nm; source 2: 2 W at 800 nm. (E = photon energy, N = photons per second.) Which option is correct?
Source 1: 2 W at 600 nm; source 2: 2 W at 800 nm. (E = photon energy, N = photons per second.) Which option is correct?
E₂ : E₁ = 3 : 4, N₁ : N₂ = 3 : 4
E₂ : E₁ = 6 : 4, N₁ : N₂ = 16 : 9
E₂ : E₁ = 4 : 3, N₁ : N₂ = 3 : 8
E₂ : E₁ = 3 : 4, N₁ : N₂ = 9 : 16
29.
Source 1: 1 W at 500 nm; source 2: 2 W at 300 nm. (E = photon energy, N = photons per second.) Which option is correct?
Source 1: 1 W at 500 nm; source 2: 2 W at 300 nm. (E = photon energy, N = photons per second.) Which option is correct?
E₂ : E₁ = 5 : 9, N₁ : N₂ = 10 : 6
E₂ : E₁ = 5 : 3, N₁ : N₂ = 5 : 6
E₂ : E₁ = 25 : 9, N₁ : N₂ = 36 : 25
E₂ : E₁ = 5 : 3, N₁ : N₂ = 5 : 12
30.
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 9000 K and 8000 K?
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 9000 K and 8000 K?
1.12
1.27
1.60
1.42
31.
A black body at 2000 K changes to 1000 K (curves shown). Which option is correct?
A black body at 2000 K changes to 1000 K (curves shown). Which option is correct?
λmax × 1/4, radiated power × 1/2
λmax × 2, radiated power × 1/8
λmax × 2, radiated power × 1/16
λmax × 1/4, radiated power × 1/4
32.
Source 1: 2 W at 600 nm; source 2: 1 W at 350 nm. (E = photon energy, N = photons per second.) Which option is correct?
Source 1: 2 W at 600 nm; source 2: 1 W at 350 nm. (E = photon energy, N = photons per second.) Which option is correct?
E₂ : E₁ = 12 : 7, N₁ : N₂ = 24 : 7
E₂ : E₁ = 12 : 7, N₁ : N₂ = 24 : 49
E₂ : E₁ = 144 : 49, N₁ : N₂ = 49 : 576
E₂ : E₁ = 7 : 12, N₁ : N₂ = 24 : 7
33.
A black body at 5000 K changes to 15000 K (curves shown). Which option is correct?
A black body at 5000 K changes to 15000 K (curves shown). Which option is correct?
λmax × 9, radiated power × 81
λmax × 1/9, radiated power × 9
λmax × 1/3, radiated power × 81
λmax × 1/9, radiated power × 3
34.
Source 1: 1 W at 400 nm; source 2: 2 W at 250 nm. (E = photon energy, N = photons per second.) Which option is correct?
Source 1: 1 W at 400 nm; source 2: 2 W at 250 nm. (E = photon energy, N = photons per second.) Which option is correct?
E₂ : E₁ = 8 : 5, N₁ : N₂ = 16 : 25
E₂ : E₁ = 8 : 5, N₁ : N₂ = 4 : 5
E₂ : E₁ = 8 : 5, N₁ : N₂ = 4 : 25
E₂ : E₁ = 16 : 5, N₁ : N₂ = 5 : 4
35.
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 2000 K and 8000 K?
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 2000 K and 8000 K?
3.91×10−3
0.0156
0.250
0.0625
36.
A black body at 3000 K changes to 4500 K (curves shown). Which option is correct?
A black body at 3000 K changes to 4500 K (curves shown). Which option is correct?
λmax × 9/4, radiated power × 27/8
λmax × 9/4, radiated power × 3/2
λmax × 3/2, radiated power × 9/4
λmax × 2/3, radiated power × 81/16
37.
The curves are for a black body at two temperatures. Curve 1 is at 10000 K. What is the temperature of curve 2? (use the peak positions)
The curves are for a black body at two temperatures. Curve 1 is at 10000 K. What is the temperature of curve 2? (use the peak positions)
6250 K
12500 K
40000 K
2500 K
38.
Source 1: 2 W at 400 nm; source 2: 1 W at 200 nm. (E = photon energy, N = photons per second.) Which option is correct?
Source 1: 2 W at 400 nm; source 2: 1 W at 200 nm. (E = photon energy, N = photons per second.) Which option is correct?
E₂ : E₁ = 1 : 4, N₁ : N₂ = 1 : 4
E₂ : E₁ = 2 : 1, N₁ : N₂ = 16 : 1
E₂ : E₁ = 1 : 2, N₁ : N₂ = 8 : 1
E₂ : E₁ = 2 : 1, N₁ : N₂ = 4 : 1
39.
A black body at 5000 K changes to 10000 K (curves shown). Which option is correct?
A black body at 5000 K changes to 10000 K (curves shown). Which option is correct?
λmax × 4, radiated power × 2
λmax × 1/2, radiated power × 8
λmax × 1/4, radiated power × 8
λmax × 1/2, radiated power × 16
40.
Source 1: 5 W at 400 nm; source 2: 1 W at 300 nm. (E = photon energy, N = photons per second.) Which option is correct?
Source 1: 5 W at 400 nm; source 2: 1 W at 300 nm. (E = photon energy, N = photons per second.) Which option is correct?
E₂ : E₁ = 4 : 3, N₁ : N₂ = 20 : 9
E₂ : E₁ = 4 : 3, N₁ : N₂ = 20 : 6
E₂ : E₁ = 8 : 3, N₁ : N₂ = 20 : 6
E₂ : E₁ = 4 : 3, N₁ : N₂ = 20 : 3
41.
The curves are for a black body at two temperatures. Curve 1 is at 4000 K. What is the temperature of curve 2? (use the peak positions)
The curves are for a black body at two temperatures. Curve 1 is at 4000 K. What is the temperature of curve 2? (use the peak positions)
10000 K
2670 K
6000 K
5000 K
42.
A black body at 3000 K changes to 9000 K (curves shown). Which option is correct?
A black body at 3000 K changes to 9000 K (curves shown). Which option is correct?
λmax × 1/3, radiated power × 27
λmax × 1/3, radiated power × 81
λmax × 3, radiated power × 9
λmax × 9, radiated power × 81
43.
Source 1: 5 W at 500 nm; source 2: 2 W at 200 nm. (E = photon energy, N = photons per second.) Which option is correct?
Source 1: 5 W at 500 nm; source 2: 2 W at 200 nm. (E = photon energy, N = photons per second.) Which option is correct?
E₂ : E₁ = 25 : 4, N₁ : N₂ = 25 : 4
E₂ : E₁ = 5 : 2, N₁ : N₂ = 25 : 4
E₂ : E₁ = 5 : 4, N₁ : N₂ = 25 : 8
E₂ : E₁ = 5 : 2, N₁ : N₂ = 16 : 625
44.
The curves are for a black body at two temperatures. Curve 1 is at 10000 K. What is the temperature of curve 2? (use the peak positions)
The curves are for a black body at two temperatures. Curve 1 is at 10000 K. What is the temperature of curve 2? (use the peak positions)
3000 K
6500 K
33300 K
13000 K
45.
The graph shows black-body radiation at 3500 K. Find the wavelength of peak intensity (Wien constant 2.9×10−3 m K).
The graph shows black-body radiation at 3500 K. Find the wavelength of peak intensity (Wien constant 2.9×10⁻³ m K).
10100 nm
414 nm
829 nm
1.21×10−3 nm
46.
The curves are for a black body at two temperatures. Curve 1 is at 7000 K. What is the temperature of curve 2? (use the peak positions)
The curves are for a black body at two temperatures. Curve 1 is at 7000 K. What is the temperature of curve 2? (use the peak positions)
4750 K
2500 K
19600 K
9500 K
47.
A black body at 5000 K changes to 7500 K (curves shown). Which option is correct?
A black body at 5000 K changes to 7500 K (curves shown). Which option is correct?
λmax × 9/4, radiated power × 27/8
λmax × 2/3, radiated power × 9/4
λmax × 2/3, radiated power × 81/16
λmax × 3/2, radiated power × 81/16
48.
The graph shows black-body radiation at 8000 K. Find the wavelength of peak intensity (Wien constant 2.9×10−3 m K).
The graph shows black-body radiation at 8000 K. Find the wavelength of peak intensity (Wien constant 2.9×10⁻³ m K).
2.76×10−3 nm
181 nm
23200 nm
362 nm
49.
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 6000 K and 5800 K?
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 6000 K and 5800 K?
1.03
1.07
1.15
1.11
50.
Source 1: 5 W at 700 nm; source 2: 2 W at 800 nm. (E = photon energy, N = photons per second.) Which option is correct?
Source 1: 5 W at 700 nm; source 2: 2 W at 800 nm. (E = photon energy, N = photons per second.) Which option is correct?
E₂ : E₁ = 7 : 8, N₁ : N₂ = 35 : 16
E₂ : E₁ = 64 : 49, N₁ : N₂ = 35 : 16
E₂ : E₁ = 64 : 49, N₁ : N₂ = 1225 : 256
E₂ : E₁ = 14 : 8, N₁ : N₂ = 16 : 35
51.
Source 1: 2 W at 450 nm; source 2: 5 W at 250 nm. (E = photon energy, N = photons per second.) Which option is correct?
Source 1: 2 W at 450 nm; source 2: 5 W at 250 nm. (E = photon energy, N = photons per second.) Which option is correct?
E₂ : E₁ = 81 : 25, N₁ : N₂ = 18 : 25
E₂ : E₁ = 9 : 5, N₁ : N₂ = 18 : 25
E₂ : E₁ = 9 : 5, N₁ : N₂ = 324 : 625
E₂ : E₁ = 18 : 5, N₁ : N₂ = 324 : 625
52.
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 6000 K and 10000 K?
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 6000 K and 10000 K?
0.216
0.600
0.130
0.360
53.
Source 1: 2 W at 450 nm; source 2: 2 W at 300 nm. (E = photon energy, N = photons per second.) Which option is correct?
Source 1: 2 W at 450 nm; source 2: 2 W at 300 nm. (E = photon energy, N = photons per second.) Which option is correct?
E₂ : E₁ = 3 : 2, N₁ : N₂ = 3 : 2
E₂ : E₁ = 4 : 9, N₁ : N₂ = 2 : 3
E₂ : E₁ = 3 : 2, N₁ : N₂ = 2 : 3
E₂ : E₁ = 6 : 2, N₁ : N₂ = 9 : 4
54.
The curves are for a black body at two temperatures. Curve 1 is at 7000 K. What is the temperature of curve 2? (use the peak positions)
The curves are for a black body at two temperatures. Curve 1 is at 7000 K. What is the temperature of curve 2? (use the peak positions)
12200 K
5500 K
4000 K
11000 K
55.
The curves are for a black body at two temperatures. Curve 1 is at 4500 K. What is the temperature of curve 2? (use the peak positions)
The curves are for a black body at two temperatures. Curve 1 is at 4500 K. What is the temperature of curve 2? (use the peak positions)
8500 K
4250 K
5060 K
4000 K
56.
The curves are for a black body at two temperatures. Curve 1 is at 5000 K. What is the temperature of curve 2? (use the peak positions)
The curves are for a black body at two temperatures. Curve 1 is at 5000 K. What is the temperature of curve 2? (use the peak positions)
14000 K
7000 K
9000 K
2780 K
57.
Source 1: 2 W at 600 nm; source 2: 5 W at 300 nm. (E = photon energy, N = photons per second.) Which option is correct?
Source 1: 2 W at 600 nm; source 2: 5 W at 300 nm. (E = photon energy, N = photons per second.) Which option is correct?
E₂ : E₁ = 4 : 1, N₁ : N₂ = 16 : 25
E₂ : E₁ = 1 : 4, N₁ : N₂ = 4 : 25
E₂ : E₁ = 1 : 4, N₁ : N₂ = 4 : 10
E₂ : E₁ = 2 : 1, N₁ : N₂ = 4 : 5
58.
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 2500 K and 8000 K?
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 2500 K and 8000 K?
9.54×10−3
0.312
0.0305
0.0977
59.
A black body at 6000 K changes to 12000 K (curves shown). Which option is correct?
A black body at 6000 K changes to 12000 K (curves shown). Which option is correct?
λmax × 4, radiated power × 2
λmax × 4, radiated power × 16
λmax × 1/2, radiated power × 16
λmax × 1/2, radiated power × 2
60.
The graph shows black-body radiation at 4500 K. Find the wavelength of peak intensity (Wien constant 2.9×10−3 m K).
The graph shows black-body radiation at 4500 K. Find the wavelength of peak intensity (Wien constant 2.9×10⁻³ m K).
322 nm
13000 nm
1.55×10−3 nm
644 nm
61.
The graph shows black-body radiation at 10000 K. Find the wavelength of peak intensity (Wien constant 2.9×10−3 m K).
The graph shows black-body radiation at 10000 K. Find the wavelength of peak intensity (Wien constant 2.9×10⁻³ m K).
290 nm
145 nm
3.45×10−3 nm
29000 nm
62.
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 9000 K and 4500 K?
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 9000 K and 4500 K?
4.00
8.00
16.0
2.00
63.
Source 1: 2 W at 600 nm; source 2: 2 W at 250 nm. (E = photon energy, N = photons per second.) Which option is correct?
Source 1: 2 W at 600 nm; source 2: 2 W at 250 nm. (E = photon energy, N = photons per second.) Which option is correct?
E₂ : E₁ = 12 : 10, N₁ : N₂ = 12 : 5
E₂ : E₁ = 12 : 5, N₁ : N₂ = 12 : 5
E₂ : E₁ = 25 : 144, N₁ : N₂ = 144 : 25
E₂ : E₁ = 25 : 144, N₁ : N₂ = 12 : 5
64.
The curves are for a black body at two temperatures. Curve 1 is at 6000 K. What is the temperature of curve 2? (use the peak positions)
The curves are for a black body at two temperatures. Curve 1 is at 6000 K. What is the temperature of curve 2? (use the peak positions)
14400 K
2500 K
8500 K
4250 K
65.
Source 1: 2 W at 500 nm; source 2: 1 W at 800 nm. (E = photon energy, N = photons per second.) Which option is correct?
Source 1: 2 W at 500 nm; source 2: 1 W at 800 nm. (E = photon energy, N = photons per second.) Which option is correct?
E₂ : E₁ = 25 : 64, N₁ : N₂ = 5 : 4
E₂ : E₁ = 8 : 5, N₁ : N₂ = 5 : 4
E₂ : E₁ = 5 : 64, N₁ : N₂ = 5 : 4
E₂ : E₁ = 5 : 8, N₁ : N₂ = 5 : 4
66.
Source 1: 1 W at 400 nm; source 2: 2 W at 800 nm. (E = photon energy, N = photons per second.) Which option is correct?
Source 1: 1 W at 400 nm; source 2: 2 W at 800 nm. (E = photon energy, N = photons per second.) Which option is correct?
E₂ : E₁ = 1 : 2, N₁ : N₂ = 1 : 4
E₂ : E₁ = 2 : 2, N₁ : N₂ = 1 : 4
E₂ : E₁ = 1 : 2, N₁ : N₂ = 1 : 16
E₂ : E₁ = 4 : 1, N₁ : N₂ = 1 : 4
67.
The curves are for a black body at two temperatures. Curve 1 is at 5000 K. What is the temperature of curve 2? (use the peak positions)
The curves are for a black body at two temperatures. Curve 1 is at 5000 K. What is the temperature of curve 2? (use the peak positions)
4000 K
3000 K
8000 K
8330 K
68.
The curves are for a black body at two temperatures. Curve 1 is at 7000 K. What is the temperature of curve 2? (use the peak positions)
The curves are for a black body at two temperatures. Curve 1 is at 7000 K. What is the temperature of curve 2? (use the peak positions)
8170 K
6500 K
13000 K
6000 K
69.
The curves are for a black body at two temperatures. Curve 1 is at 8000 K. What is the temperature of curve 2? (use the peak positions)
The curves are for a black body at two temperatures. Curve 1 is at 8000 K. What is the temperature of curve 2? (use the peak positions)
5500 K
21300 K
11000 K
3000 K
70.
The curves are for a black body at two temperatures. Curve 1 is at 3000 K. What is the temperature of curve 2? (use the peak positions)
The curves are for a black body at two temperatures. Curve 1 is at 3000 K. What is the temperature of curve 2? (use the peak positions)
4500 K
9000 K
6000 K
1500 K
71.
The curves are for a black body at two temperatures. Curve 1 is at 3500 K. What is the temperature of curve 2? (use the peak positions)
The curves are for a black body at two temperatures. Curve 1 is at 3500 K. What is the temperature of curve 2? (use the peak positions)
3000 K
4080 K
6500 K
3250 K
72.
The curves are for a black body at two temperatures. Curve 1 is at 3500 K. What is the temperature of curve 2? (use the peak positions)
The curves are for a black body at two temperatures. Curve 1 is at 3500 K. What is the temperature of curve 2? (use the peak positions)
7500 K
3750 K
3060 K
4000 K
73.
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 12000 K and 4500 K?
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 12000 K and 4500 K?
50.6
2.67
19.0
7.11
74.
The curves are for a black body at two temperatures. Curve 1 is at 4500 K. What is the temperature of curve 2? (use the peak positions)
The curves are for a black body at two temperatures. Curve 1 is at 4500 K. What is the temperature of curve 2? (use the peak positions)
10500 K
6000 K
3380 K
5250 K
75.
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 2500 K and 4000 K?
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 2500 K and 4000 K?
0.244
0.153
0.391
0.625
76.
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 3000 K and 4500 K?
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 3000 K and 4500 K?
0.296
0.198
0.667
0.444
77.
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 9000 K and 7000 K?
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 9000 K and 7000 K?
1.29
1.65
2.73
2.13
78.
Source 1: 2 W at 500 nm; source 2: 5 W at 250 nm. (E = photon energy, N = photons per second.) Which option is correct?
Source 1: 2 W at 500 nm; source 2: 5 W at 250 nm. (E = photon energy, N = photons per second.) Which option is correct?
E₂ : E₁ = 2 : 1, N₁ : N₂ = 4 : 10
E₂ : E₁ = 1 : 4, N₁ : N₂ = 4 : 25
E₂ : E₁ = 1 : 4, N₁ : N₂ = 25 : 16
E₂ : E₁ = 2 : 1, N₁ : N₂ = 4 : 5
79.
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 2000 K and 4000 K?
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 2000 K and 4000 K?
0.0625
0.125
0.500
0.250
80.
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 2000 K and 5000 K?
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 2000 K and 5000 K?
0.160
0.400
0.0640
0.0256
81.
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 3000 K and 7000 K?
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 3000 K and 7000 K?
0.184
0.0787
0.429
0.0337
82.
Source 1: 2 W at 700 nm; source 2: 2 W at 350 nm. (E = photon energy, N = photons per second.) Which option is correct?
Source 1: 2 W at 700 nm; source 2: 2 W at 350 nm. (E = photon energy, N = photons per second.) Which option is correct?
E₂ : E₁ = 1 : 2, N₁ : N₂ = 2 : 1
E₂ : E₁ = 1 : 4, N₁ : N₂ = 2 : 1
E₂ : E₁ = 2 : 1, N₁ : N₂ = 2 : 1
E₂ : E₁ = 1 : 4, N₁ : N₂ = 2 : 2
83.
The curves are for a black body at two temperatures. Curve 1 is at 3500 K. What is the temperature of curve 2? (use the peak positions)
The curves are for a black body at two temperatures. Curve 1 is at 3500 K. What is the temperature of curve 2? (use the peak positions)
4900 K
2500 K
6000 K
3000 K
84.
The curves are for a black body at two temperatures. Curve 1 is at 3000 K. What is the temperature of curve 2? (use the peak positions)
The curves are for a black body at two temperatures. Curve 1 is at 3000 K. What is the temperature of curve 2? (use the peak positions)
15000 K
7500 K
12000 K
750 K
85.
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 9000 K and 6000 K?
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 9000 K and 6000 K?
3.38
2.25
1.50
5.06
86.
The curves are for a black body at two temperatures. Curve 1 is at 5800 K. What is the temperature of curve 2? (use the peak positions)
The curves are for a black body at two temperatures. Curve 1 is at 5800 K. What is the temperature of curve 2? (use the peak positions)
14800 K
3740 K
9000 K
7400 K
87.
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 12000 K and 5800 K?
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 12000 K and 5800 K?
18.3
2.07
4.28
8.86
88.
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 12000 K and 10000 K?
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 12000 K and 10000 K?
2.07
1.73
1.20
1.44
89.
The curves are for a black body at two temperatures. Curve 1 is at 10000 K. What is the temperature of curve 2? (use the peak positions)
The curves are for a black body at two temperatures. Curve 1 is at 10000 K. What is the temperature of curve 2? (use the peak positions)
19000 K
9000 K
11100 K
9500 K
90.
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 9000 K and 3000 K?
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 9000 K and 3000 K?
27.0
3.00
9.00
81.0
91.
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 6000 K and 3500 K?
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 6000 K and 3500 K?
2.94
5.04
8.64
1.71
92.
The curves are for a black body at two temperatures. Curve 1 is at 3500 K. What is the temperature of curve 2? (use the peak positions)
The curves are for a black body at two temperatures. Curve 1 is at 3500 K. What is the temperature of curve 2? (use the peak positions)
6250 K
12500 K
1360 K
9000 K
93.
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 6000 K and 8000 K?
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 6000 K and 8000 K?
0.422
0.562
0.316
0.750
94.
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 2500 K and 3000 K?
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 2500 K and 3000 K?
0.833
0.482
0.579
0.694
95.
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 12000 K and 6000 K?
What is the ratio P₂/P₁ of total power radiated per unit area for the black body at 12000 K and 6000 K?
8.00
4.00
2.00
16.0
96.
The curves are for a black body at two temperatures. Curve 1 is at 4500 K. What is the temperature of curve 2? (use the peak positions)
The curves are for a black body at two temperatures. Curve 1 is at 4500 K. What is the temperature of curve 2? (use the peak positions)
6500 K
2000 K
10100 K
3250 K
97.
The curves are for a black body at two temperatures. Curve 1 is at 5000 K. What is the temperature of curve 2? (use the peak positions)
The curves are for a black body at two temperatures. Curve 1 is at 5000 K. What is the temperature of curve 2? (use the peak positions)
7500 K
3750 K
10000 K
2500 K
98.
The curves are for a black body at two temperatures. Curve 1 is at 5000 K. What is the temperature of curve 2? (use the peak positions)
The curves are for a black body at two temperatures. Curve 1 is at 5000 K. What is the temperature of curve 2? (use the peak positions)
4500 K
4000 K
6250 K
9000 K
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