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- 1. Multiple Choice
According to Einstein's theory, the energy of a photon is
proportional to its wavelength.
proportional to its frequency.
constant, since the speed of light is a constant.
quantized, since it always appears in bundles of size, 1.6 × 10−19 C.
proportional to the square of the frequency.
- 2. Multiple Choice
Light behaves like
a wave at times, and a particle at other times.
a wave.
a particle.
none of these
- 3. Multiple Choice
The wavelength of light visible to the human eye is on the order of 5 × 10−7 m. If the speed of light in air is 3 × 108 m/s, find the frequency of the lightwave.
3 × 107 Hz
4 × 109 Hz
5 × 1011 Hz
6 × 1014 Hz
4 × 1015 Hz
- 4. Multiple Choice
Find the frequency of X-rays of wavelength 1 Å = 10−10 m.
3 × 1018 Hz
3 × 1010 MHz
6 × 109 Hz
3 × 108 Hz
3 × 1020 Hz
- 5. Multiple Choice
An FM radio station broadcasts at 98.6 MHz. What is the wavelength of the radiowaves?
60.8 m
6.08 m
3.04 m
0.314 m
0.33 cm
- 6. Multiple Choice
You can raise the temperature of an object with
microwaves.
infrared waves.
ultraviolet rays
all of the above.
only (a) and (b) above.
- 7. Multiple Choice
Find the force exerted by reflecting sunlight off a reflecting aluminum sheet in space if the area normal to the sunlight is 10 000 m2 and the solar intensity is 1 350 W/m2.
0.72 N
0.09 N
9 N
45 N
0.18 N
- 8. Multiple Choice
An AC generator with peak voltage 100 volts is placed across a 10-Ω resistor. What is the average power dissipated?
100 W
150 W
500 W
1000 W
2000 W
- 9. Multiple Choice
An electric heater draws an average power of 1 100 watts when plugged into a 110-V rms outlet. Calculate the resistance of the heater and the rms current.
11 Ω, 10 A (rms)
110 Ω, 10 A (rms)
10 Ω, 11 A (rms)
10 Ω, 110 A (rms)
0.09 Ω, 11 A (rms)
- 10. Multiple Choice
Capacitive reactance XC is given by
1/ωC.
ωC.
ω/C.
C/ω.
1/ω2C.
- 11. Multiple Choice
A series RLC circuit has an impedance of 120 Ω and a resistance of 64 Ω. What average power is delivered to this circuit when Vrms = 90 volts?
36 W
100 W
192 W
360 W
12 W
- 12. Multiple Choice
An LC circuit is to have resonant oscillations at 5.0 MHz. Find the value of a capacitor which will work with a 1.0-mH inductor.
2.0 mF
1.0 μF
0.020 μF
1.0 pF
40 pF
- 13. Multiple Choice
In a parallel RLC circuit, where IR = IR, max sin(ωt), the current through the capacitor, IC, is
IC = −IC, max sin(ωt).
IC = IC, max sin(ωt).
IC = −IC, max cos(ωt).
IC = IC, max cos(ωt).
IC = IC, max tan(ωt).
- 14. Multiple Choice
Find the resonant frequency for a series RLC circuit where R = 10 Ω, C = 5.00 μF, and L = 2.00 mH.
998 Hz
1.59 kHz
2.45 kHz
11.3 kHz
2.53 kHz
- 15. Multiple Choice
A step-up transformer has an input voltage of 110 V (rms). There are 100 turns on the primary and 1 500 on the secondary. What is the output voltage?
1 600 V (max)
1 650 V (rms)
3 260 V (max)
165 kV (rms)
7.3 V (rms)
- 16. Multiple Choice
Green light has a wavelength of 5.4 × 10−7 m. What is the frequency of this EM wave in air?
5.55 × 1014 Hz
6.00 × 1011 Hz
9.00 × 108 Hz
3.00 × 1010 MHz
1.80 × 1015 Hz
- 17. Multiple Choice
What is the inductance of a series RL circuit in which R = 1.0 kΩ if the current increases to one-third of its final value in 30 μs?
74 mH
99 mH
49 mH
62 mH
none of these.
- 18. Multiple Choice
Which of the following are the units of a henry and a farad, respectively?
J ⋅ s2/C2 and C2/J
V ⋅ s/A and V/C
V/(A ⋅ s) and C/V
N ⋅ m/A2 and 1/J
none of these
- 19. Multiple Choice
The figure shows an LR circuit with a switch and a 240-volt battery. At the instant the switch is closed, the current in the circuit and the potential difference between points a and b, Vab, are
0 A, 0 V
0 A, −240 V
0 A, +240 V
0.024 A, 0 V
0.024 A, +240 V
- 20. Multiple Choice
A series LC circuit contains a 100-mH inductor, a 36.0-mF capacitor and a 12-V battery. The frequency of the electromagnetic oscillations in the circuit is
5.73 × 10−4 Hz.
9.55 × 10−3 Hz.
0.442 Hz.
2.65 Hz.
44.0 Hz.
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