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Course: American System Physics
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American System Physics

A Physics Toolkit

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Representing Motion

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Accelerated Motion

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Forces in One Dimension

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Displacement and Force in Two Dimensions

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Motion in Two Dimensions

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Gravitation

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Rotational Motion

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Momentum and Its Conservation

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Energy and Its Conservation

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Thermal Energy

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States of Matter

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Vibrations and Waves

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Sound

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Fundamentals of Light

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Reflection and Refraction

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Interference and Diffraction

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Electrostatics

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Electric Current and Circuits

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Magnetic Fields

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Electromagnetic Induction and Electromagnetism

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Quantum Theory and the Atom

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Solid-State Electronics

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Nuclear and Particle Physics

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Quiz

15.3 Color and the Electromagnetic Spectrum – Quiz

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Color and the Electromagnetic Spectrum American Physics quiz: free practice for American System Physics. Work through this Color and the Electromagnetic Spectrum American Physics quiz and get instant feedback on every answer. If you get stuck, review the 15.3 Color and the Electromagnetic Spectrum — Notes lesson. More practice: American System Physics — all units. Syllabus: OpenStax free science textbooks.

  • Questions count: 50
  • Passing grade: A-
  • Time limit:
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1.
The diagram shows white light dispersed by a glass prism into rays P, Q and R. Which ray is violet?
Dr Dabour Hub Academy - figure 1
R
P
Q
All three are violet
2.
The diagram shows the EM spectrum. Which region is B?
Dr Dabour Hub Academy - figure 2
Microwaves
Gamma rays
Ultraviolet
Infrared
3.
In the diagram of the EM spectrum, which region, A or C, has the longer wavelength, and what is it?
Dr Dabour Hub Academy - figure 3
C: gamma rays
A: gamma rays
C: microwaves
A: microwaves
4.
The diagram shows red, green and blue spotlights overlapping on a white screen. What colours are seen at X, Y and Z?
Dr Dabour Hub Academy - figure 4
X yellow, Y cyan, Z white
X cyan, Y yellow, Z black
X magenta, Y yellow, Z white
X yellow, Y magenta, Z black
5.
The bar chart shows how much of each colour a paint reflects. What colour does the paint appear in white light?
Dr Dabour Hub Academy - figure 5
Green
Blue
Orange-red to yellow (it reflects red, orange and yellow)
Black
6.
Using the bar chart, how would the paint appear under pure green light?
Dr Dabour Hub Academy - figure 6
Bright green
Bright red
White
Very dark, almost black
7.
The diagram shows a snapshot of a light wave in a vacuum. What is its frequency?
Dr Dabour Hub Academy - figure 7
4.84 × 10¹⁴ Hz
9.68 × 10¹⁴ Hz
2.42 × 10¹⁴ Hz
186 Hz
8.
The diagram marks three sources P, Q and S on a frequency scale. Which source emits ionising radiation?
Dr Dabour Hub Academy - figure 8
P
S
Q
P and Q
9.
Using the diagram, what is the approximate wavelength of the waves from source Q (about 10¹⁰·⁴ Hz ≈ 2.5 × 10¹⁰ Hz)?
Dr Dabour Hub Academy - figure 9
12 m
0.12 mm
1.2 cm
120 nm
10.
In the prism experiment in the table, what would be seen on the screen with a red filter followed by a green filter?
Yellow light
Almost no light (darkness)
Red light only
Green light only
11.
What does the thermometer data in the table show?
Violet light carries the most heating energy
The prism absorbs infrared completely
Invisible radiation (infrared) beyond the red end transfers energy
There is no radiation beyond the visible spectrum
12.
Complete the table: how does the red apple look in green light?
Red
Green
Black
Yellow
13.
Using the table, radiation of wavelength 5.0 × 10⁻⁵ m is classified as which region?
Infrared
Microwave
Ultraviolet
Radio
14.
Using the table, which colour travels slowest in the glass, and at what speed?
Red, 1.98 × 10⁸ m/s
Violet, 1.96 × 10⁸ m/s
Violet, 4.60 × 10⁸ m/s
Green, 3.00 × 10⁸ m/s
15.
An FM radio station broadcasts at 98.0 MHz. What is the wavelength of this radiation in a vacuum?
3.06 m
0.327 m
2.94 × 10¹⁶ m
3061 m
16.
Food in a microwave oven is heated by waves at 2.45 GHz. How long is one wavelength of these waves?
8.17 m
0.122 m
7.35 × 10¹⁷ m
122 m
17.
A hospital scanner emits X-rays at 3.0 × 10¹⁸ Hz. Calculate their wavelength.
1.00 × 10¹⁰ m
9.00 × 10²⁶ m
1.00 × 10⁻¹⁰ m
1.00 × 10⁻⁷ m
18.
Radiation has a vacuum wavelength of 250 nm. What is its frequency and to which region does it belong?
1.20 × 10¹⁵ Hz, visible light
1.20 × 10⁶ Hz, ultraviolet
1.20 × 10¹⁵ Hz, X-rays
1.20 × 10¹⁵ Hz, ultraviolet
19.
An optical-fibre network uses a laser of wavelength 1500 nm. Find its frequency and name the EM region it belongs to.
2.00 × 10¹⁴ Hz, infrared
2.00 × 10¹⁴ Hz, visible light
2.00 × 10⁵ Hz, infrared
2.00 × 10¹⁴ Hz, microwaves
20.
A satellite is 3.6 × 10⁷ m above a TV receiver. How long does its microwave signal take to arrive?
1.08 × 10¹⁶ s
120 s
0.120 s
1.06 × 10⁵ s
21.
Each part of the EM spectrum has practical uses. Which region is linked to a genuine use?
Ultraviolet — security marking
Gamma rays — TV remote controls
Radio waves — medical imaging of bones
Infrared — sterilising water
22.
Safety posters warn about radiation dangers. Which radiation is linked with its real hazard?
Radio waves — skin cancer
X-rays — cell mutation and cancer
Visible light — ionisation of DNA at low intensity
Infrared — cell mutation
23.
Which pairing of two primary light colours and the secondary colour they make is correct?
Red + blue — yellow
Red + green — magenta
Green + blue — cyan
Green + blue — magenta
24.
Complementary colours of light add to white. Which colour is listed with its complement?
Red — magenta
Blue — cyan
Green — yellow
Green — magenta
25.
Colour mixing happens in devices around the home. Which mixing type is linked with a correct example?
Additive — phone screens
Subtractive — TV pixels
Additive — printer inks
Subtractive — stage spotlights
26.
Why is the thermometer bulb blackened in the infrared experiment?
A black surface absorbs radiation well, making the temperature rise larger and easier to detect
Black bulbs reflect infrared into the thermometer
It makes the thermometer longer
It stops visible light from being dispersed
27.
A student shows that a second, inverted prism recombines the spectrum into white light. What does this show?
The prism adds colour to white light
White light is a mixture of colours that the first prism separated
Glass absorbs all colours except white
Light is longitudinal
28.
In the table, the missing result for combining all three primary pigments is ideally _____.
white
black
brown-yellow
green
29.
Microwaves of wavelength 12 cm have a frequency of _____.
4.00 × 10⁻¹⁰ Hz
2.50 × 10⁹ Hz
3.60 × 10⁷ Hz
2500 Hz
30.
The splitting of white light into its component colours by a prism is called _____.
polarization
dispersion
diffraction
reflection
31.
The primary pigments are cyan, magenta and _____.
green
red
yellow
blue
32.
A white shirt seen through a red filter appears _____.
white
black
cyan
red
33.
Radiation with enough energy to remove electrons from atoms is called _____ radiation.
ionising
infrared
polarized
monochromatic
34.
In the prism diagram, ray P is red because red light is refracted least. True or false?
Dr Dabour Hub Academy - figure 10
False, P is violet
True
False, red is refracted most
True only if the prism is plastic
35.
If the green spotlight in the diagram is switched off, region Z becomes magenta. True or false?
Dr Dabour Hub Academy - figure 11
False, it becomes yellow
True
False, it becomes black
False, it stays white
36.
In the thermometer experiment, the reading "room, away from beam" acts as a control. True or false?
False, it is the independent variable
False, it is anomalous and should be ignored
True only if the prism is removed
True
37.
The table shows a yellow banana appearing red under red light; this is because yellow objects reflect both red and green. True or false?
False, the banana emits red light
False, yellow objects absorb red
True only for ripe bananas
True
38.
All electromagnetic waves travel at the same speed in a vacuum. True or false?
False, gamma rays travel fastest
False, radio waves travel fastest
True only for visible light
True
39.
Radio waves have more energy per photon than X-rays because their wavelength is longer. True or false?
False, X-rays have higher frequency and more energy per photon
True
True only in air
False, they have equal energy
40.
Mixing red and green light gives yellow light. True or false?
False, it gives brown
True
False, it gives cyan
True only for pigments
41.
Mixing yellow paint and blue paint ideally produces white. True or false?
True
True only under sunlight
False, pigments mix subtractively, so the mixture is darker, not white
False, it gives yellow
42.
A red book viewed in pure blue light appears black. True or false?
False, it appears red
False, it appears blue
False, it appears magenta
True
43.
In a glass prism violet light travels slower than red light and is refracted more. True or false?
True
False, red is refracted more
False, all colours travel at the same speed in glass
True only in a vacuum
44.
Infrared radiation has shorter wavelengths than visible light. True or false?
True
False, infrared wavelengths are longer than red light
True only for thermal cameras
False, infrared is not electromagnetic
45.
Blue and yellow light are complementary colours. True or false?
False, blue and red are complementary
False, complementary colours give black
True
True only for pigments
46.
Microwaves are ionising radiation and cause cancer by damaging DNA. True or false?
True
True only at high frequencies of radio
False, microwaves are completely harmless in all amounts
False, microwaves are non-ionising; their main hazard is heating tissue
47.
A green filter transmits green light and absorbs other colours. True or false?
True
False, it absorbs green light
False, it changes all colours into green
True only for laser light
48.
Yellow pigment absorbs blue light and reflects red and green. True or false?
False, it absorbs red and green
True
False, it reflects only yellow wavelengths and absorbs red and green
True only in blue light
49.
Gamma rays are used to sterilise medical equipment because their high energy kills microorganisms. True or false?
False, gamma rays are used for TV broadcasting
False, gamma rays have low energy
True
True only for plastic equipment
50.
A rainbow is produced by dispersion of sunlight in raindrops. True or false?
False, it is produced by polarization
False, it is produced by diffraction around clouds
True only at night
True
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Part of Fundamentals of Light — see every lesson and quiz in this unit.
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