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Physics

Chapter 1 - Electric Current, Ohms Law and Kirchhoffs Laws

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Chapter 2 - Magnetic Effects of Electric Current and Measuring Instruments

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Chapter 3 - Electromagnetic Induction and AC Dynamo and Transformer

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Chapter 4 - Alternating Current AC Circuits

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Chapter 5 - Dual Nature of Wave and Particle

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Chapter 6 - Atomic Spectra and X-Rays

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Chapter 7 - Lasers and Principles

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Chapter 8 - Modern Electronics and Semiconductors

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Quiz

Lesson 1 Quiz: Blackbody Radiation, Max Planck Hypothesis and the Photon

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1.
STEM Physics Problem 39: A copper wire of resistance 8.0 Ω is drawn out uniformly so that its length increases to three times its original value. Assuming constant mass and density, what is the new resistance of the wire?
16.0 Ω
24.0 Ω
72.0 Ω
2.67 Ω
2.
STEM Physics Problem 33: A copper wire of resistance 8.0 Ω is drawn out uniformly so that its length increases to three times its original value. Assuming constant mass and density, what is the new resistance of the wire?
16.0 Ω
2.67 Ω
24.0 Ω
72.0 Ω
3.
STEM Modern Physics Laser Problem 11: What fundamental condition is strictly required to achieve laser amplification via stimulated emission?
Complete absence of resonant optical mirrors
Thermal equilibrium where ground state atoms dominate
Population inversion, where the number of atoms in the metastable excited state exceeds that in the lower energy state
High electrical resistance in the discharge tube
4.
STEM AC Transformer Problem 6: An ideal step-down transformer connected to a 220 V mains supply delivers power to a 12 V, 24 W lamp. What is the current flowing in the primary coil?
1.5 A
0.545 A
2.0 A
0.109 A
5.
STEM AC Transformer Problem 40: An ideal step-down transformer connected to a 220 V mains supply delivers power to a 12 V, 24 W lamp. What is the current flowing in the primary coil?
2.0 A
0.109 A
0.545 A
1.5 A
6.
STEM Kirchhoff's Laws Problem 23: In a closed circuit junction, currents I1 = 2 A and I2 = 3 A flow toward junction A, while I3 = 1 A flows away. According to Kirchhoff's First Law (KCL), what is the magnitude and direction of the remaining current I
4 A flowing away from junction A
2 A flowing toward junction A
6 A flowing away from junction A
4 A flowing toward junction A
7.
STEM Physics Problem 15: A copper wire of resistance 8.0 Ω is drawn out uniformly so that its length increases to three times its original value. Assuming constant mass and density, what is the new resistance of the wire?
72.0 Ω
24.0 Ω
16.0 Ω
2.67 Ω
8.
STEM Physics Problem 40: A copper wire of resistance 8.0 Ω is drawn out uniformly so that its length increases to three times its original value. Assuming constant mass and density, what is the new resistance of the wire?
72.0 Ω
16.0 Ω
2.67 Ω
24.0 Ω
9.
STEM Modern Physics Laser Problem 21: What fundamental condition is strictly required to achieve laser amplification via stimulated emission?
High electrical resistance in the discharge tube
Population inversion, where the number of atoms in the metastable excited state exceeds that in the lower energy state
Thermal equilibrium where ground state atoms dominate
Complete absence of resonant optical mirrors
10.
STEM AC Transformer Problem 32: An ideal step-down transformer connected to a 220 V mains supply delivers power to a 12 V, 24 W lamp. What is the current flowing in the primary coil?
0.109 A
2.0 A
1.5 A
0.545 A
11.
STEM Modern Physics Laser Problem 3: What fundamental condition is strictly required to achieve laser amplification via stimulated emission?
Population inversion, where the number of atoms in the metastable excited state exceeds that in the lower energy state
High electrical resistance in the discharge tube
Complete absence of resonant optical mirrors
Thermal equilibrium where ground state atoms dominate
12.
STEM Kirchhoff's Laws Problem 1: In a closed circuit junction, currents I1 = 2 A and I2 = 3 A flow toward junction A, while I3 = 1 A flows away. According to Kirchhoff's First Law (KCL), what is the magnitude and direction of the remaining current I4
4 A flowing away from junction A
2 A flowing toward junction A
6 A flowing away from junction A
4 A flowing toward junction A
13.
STEM Modern Physics Laser Problem 10: What fundamental condition is strictly required to achieve laser amplification via stimulated emission?
Population inversion, where the number of atoms in the metastable excited state exceeds that in the lower energy state
Complete absence of resonant optical mirrors
High electrical resistance in the discharge tube
Thermal equilibrium where ground state atoms dominate
14.
STEM AC Transformer Problem 14: An ideal step-down transformer connected to a 220 V mains supply delivers power to a 12 V, 24 W lamp. What is the current flowing in the primary coil?
2.0 A
0.545 A
1.5 A
0.109 A
15.
STEM Kirchhoff's Laws Problem 34: In a closed circuit junction, currents I1 = 2 A and I2 = 3 A flow toward junction A, while I3 = 1 A flows away. According to Kirchhoff's First Law (KCL), what is the magnitude and direction of the remaining current I
6 A flowing away from junction A
2 A flowing toward junction A
4 A flowing away from junction A
4 A flowing toward junction A
16.
STEM AC Transformer Problem 36: An ideal step-down transformer connected to a 220 V mains supply delivers power to a 12 V, 24 W lamp. What is the current flowing in the primary coil?
1.5 A
0.545 A
0.109 A
2.0 A
17.
STEM AC Transformer Problem 39: An ideal step-down transformer connected to a 220 V mains supply delivers power to a 12 V, 24 W lamp. What is the current flowing in the primary coil?
0.545 A
0.109 A
2.0 A
1.5 A
18.
STEM Kirchhoff's Laws Problem 9: In a closed circuit junction, currents I1 = 2 A and I2 = 3 A flow toward junction A, while I3 = 1 A flows away. According to Kirchhoff's First Law (KCL), what is the magnitude and direction of the remaining current I4
4 A flowing away from junction A
6 A flowing away from junction A
4 A flowing toward junction A
2 A flowing toward junction A
19.
STEM AC Transformer Problem 22: An ideal step-down transformer connected to a 220 V mains supply delivers power to a 12 V, 24 W lamp. What is the current flowing in the primary coil?
1.5 A
0.545 A
2.0 A
0.109 A
20.
STEM Compton Effect Problem 38: In the Compton scattering effect, when a high-energy X-ray photon collides with a free stationary electron, which change occurs to the scattered photon?
Its mass increases while kinetic energy decreases
Its frequency decreases, its wavelength increases, and its speed remains strictly c (speed of light)
Its speed decreases significantly while wavelength remains constant
Its frequency increases and energy increases
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