Find the frequency of X-rays of wavelength 1 Å = 10?10 m.
A. 3 × 1018 Hz
B. 3 × 1010 MHz
C. 6 × 109 Hz
D. 3 × 108 Hz
E. 3 × 1020 Hz
Answer: A
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Fill in the blank(s) with the appropriate word(s).
A solenoid of length 0.700 m having a circular cross-section of radius 5.00 cm stores 6.00 µJ of energy when a 0.400-A current runs through it. What is the winding density of the solenoid? (?0 = 4? × 10-7 T ? m/A)
A) 104 turns/m B) 327 turns/m C) 1080 turns/m D) 865 turns/m E) 472 turns/m
Since accelerations are equivalent to gravity, a person could cancel the effects of Earth's gravity by
A) falling from a high place. B) going into orbit around Earth. C) Both of the above. D) accelerating straight upward at an acceleration of 1g. E) Nonsense--you can't cancel the effects of gravity.
Two wave pulses with equal positive amplitudes pass each other on a string, one is traveling toward the right and the other toward the left. At the point that they occupy the same region of space at the same time
A) constructive interference occurs. B) destructive interference occurs. C) a standing wave is produced. D) a traveling wave is produced. E) a wave pulse is produced.