If 5.0 × 10^21 electrons pass through a 20-W resistor in 10 min, what is the potential difference across the resistor?
a. 21 V
b. 32 V
c. 27 V
d. 37 V
e. 54 V
C
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An initially uncharged parallel plate capacitor of capacitance C is charged to potential V by a battery. The battery is then disconnected. Which statement is correct?
A. There is no charge on either plate of the capacitor. B. The capacitor can be discharged by grounding any one of its two plates. C. Charge is distributed evenly over both the inner and outer surfaces of the plates. D. The magnitude of the electric field outside the space between the plates is approximately zero. E. The capacitance increases when the distance between the plates increases.
A tuning fork is sounded above a resonating tube (one end closed), which resonates at a length of 0.40 m and again at 1.2 m. If the tube length were extended further, at what point will the tuning fork again create a resonance condition?
a. 1.6 m b. 2.0 m c. 2.4 m d. 3.2 m e. 6.4 m
If y = 0.02 sin (30x - 400t) (SI units), the frequency of the wave is
a. 30 Hz b. 15/p Hz c. 200/p Hz d. 400 Hz e. 800p Hz
In the Compton effect, a photon of wavelength 
and frequency f is scattered from an electron. Initially, at rest
A. the electron gains energy from the photon so that the scattered photon's wave length is less than
B. the electron gives energy to the scattered photon so the photon's frequency is greater than f.
C. momentum is not conserved, but energy is conserved.
D. the photon loses energy so that the scattered photon has a frequency less than f.