A light source blinks once per second in its own frame of reference. As you approach the blinking source, you observe the frequency of blinks to be
A) less than 1 Hz.
B) 1 Hz.
C) more than 1 Hz.
Answer: C
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How can we see through the dusty plane of the Milky Way disk in order to study star formation?
a) Use the radial velocity technique. b) Look at visible radiation from space with the Hubble Space Telescope. c) Use an optical telescope from the ground with a higher angular resolution. d) Look at infrared radiation with the Spitzer Space Telescope. e) Obtain a rotation curve using the gas in the Milky Way disk.
The ratio of a photon's energy to its frequency is
A) its speed. B) its wavelength. C) its amplitude. D) Planck's constant. E) none of the above
A 10-?F capacitor in an LC circuit made entirely of superconducting materials (R = 0 ?) is charged to 100 ?C. Then a superconducting switch is closed. At t = 0 s, plate 1 is positively charged and plate 2 is negatively charged. At a later time, Vab = +10 V. At that time, Vdc is
A. 0 V. B. 3.54 V. C. 5.0 V. D. 7.07 V. E. 10 V.
A charge Q accumulates on the hollow metallic dome, of radius R, of a Van de Graaff generator. A probe measures the electric field strength at various points outside the sphere surface. If the probe is initially at a distance 3R from the sphere's center and then is moved to 5R, by what factor will the electric field reading change?
a. 3/5 c. 5/3 b. (5/3)2 d. (3/5)2