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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 2 Quiz: Magnetic Force on Currents, Torque and Magnetic Dipole Moment

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  • Questions count: 20
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1.
Light of frequency \(3 \times 10^{14}\) Hz shines on a metal whose threshold frequency is \(4.5 \times 10^{14}\) Hz. If the intensity is increased 100 times, the photoelectric current will be:
A) 100 times initial current
B) 10 times initial current
C) Zero
D) Infinite
2.
STEM Modern Physics Laser Problem 8: What fundamental condition is strictly required to achieve laser amplification via stimulated emission?
Thermal equilibrium where ground state atoms dominate
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
Complete absence of resonant optical mirrors
3.
In an R-L-C circuit, if \(V_R = 30\) V, \(V_L = 80\) V, and \(V_C = 40\) V, the total supply voltage across the circuit is:
A) 150 V
B) 70 V
C) 50 V
D) 10 V
4.
STEM Modern Physics Laser Problem 20: What fundamental condition is strictly required to achieve laser amplification via stimulated emission?
Complete absence of resonant optical mirrors
High electrical resistance in the discharge tube
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
5.
In a pure capacitor circuit connected to an AC source, the average power consumed over a full cycle is:
B) \(I_{text{eff}}^2 times X_C\)
A) \(V_{text{eff}} times I_{text{eff}}\)
D) \(0.5 times V_{max} times I_{max}\)
C) Zero
6.
Why are hydroelectric storage dams constructed with a base that is significantly thicker than the crest?
Because hydrostatic water pressure increases linearly with depth (P = rho * g * h), exerting immense overturning forces at the bottom
To allow fish to swim upstream through drainage gates
To reduce the gravitational pull of the bedrock
To prevent solar radiation from penetrating the foundation
7.
STEM Modern Physics Laser Problem 12: 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
8.
In stimulated emission, the emitted photon and the triggering incident photon are characterized by having:
A) Different wavelengths and perpendicular directions
C) A random phase difference of $pi/2$
B) The exact same phase, frequency, direction, and polarization
D) Independent speeds in vacuum
9.
STEM Modern Physics Laser Problem 25: What fundamental condition is strictly required to achieve laser amplification via stimulated emission?
Thermal equilibrium where ground state atoms dominate
High electrical resistance in the discharge tube
Complete absence of resonant optical mirrors
Population inversion, where the number of atoms in the metastable excited state exceeds that in the lower energy state
10.
STEM Modern Physics Laser Problem 14: 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
Thermal equilibrium where ground state atoms dominate
High electrical resistance in the discharge tube
11.
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
High electrical resistance in the discharge tube
Complete absence of resonant optical mirrors
Thermal equilibrium where ground state atoms dominate
12.
In a hydraulic press, if the radius of the large piston is 4 times that of the small piston, the mechanical advantage is:
2
4
8
16
13.
STEM Modern Physics Laser Problem 7: What fundamental condition is strictly required to achieve laser amplification via stimulated emission?
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
Complete absence of resonant optical mirrors
14.
STEM Modern Physics Laser Problem 17: What fundamental condition is strictly required to achieve laser amplification via stimulated emission?
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
Complete absence of resonant optical mirrors
15.
STEM Modern Physics Laser Problem 15: What fundamental condition is strictly required to achieve laser amplification via stimulated emission?
Complete absence of resonant optical mirrors
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
16.
STEM Modern Physics Laser Problem 26: 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
17.
STEM Modern Physics Laser Problem 34: What fundamental condition is strictly required to achieve laser amplification via stimulated emission?
Complete absence of resonant optical mirrors
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
18.
STEM Modern Physics Laser Problem 3: What fundamental condition is strictly required to achieve laser amplification via stimulated emission?
Thermal equilibrium where ground state atoms dominate
Complete absence of resonant optical mirrors
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
19.
STEM Modern Physics Laser Problem 19: What fundamental condition is strictly required to achieve laser amplification via stimulated emission?
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
Complete absence of resonant optical mirrors
20.
If the frequency of an AC circuit containing a capacitor is doubled, its capacitive reactance (\(X_C\)) will:
B) Quadruple
C) Decrease to half its initial value
D) Remain unchanged
A) Double
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