The field lines due to two spheres with like charges are shown by ___.
A. a
B. b
C. c
D. d
B. b
Like charges repel.
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The hydroxide ion has a charge of
a. 1–. b. zero. c. 1+. d. 2+.
Absolute visual magnitude is
a. the apparent magnitude of a star observed from Earth. b. the luminosity of a star observed from a distance of 1000 pc. c. the apparent magnitude of a star observed from a distance of 10 pc. d. the luminosity of a star observed from Earth. e. c and d
A quasar in a galaxy that is merging with another galaxy would be
A) the source of a gamma ray burst. B) less luminous because of the loss of material to tidal debris during the merger. C) more luminous because of a greater supply of fuel. D) destroyed in the process of the merger. E) the source of a Type Ia supernova explosion.
Two radio antennas are 10 km apart on a north-south axis on high mountain tops at the seacoast. The antennas broadcast identical AM radio signals,
in phase, at a frequency of 4.70 MHz. A steamship, 200 km offshore, travels toward the north at 15 km/h and passes east of the antennas. A radio on board the ship is tuned to the broadcast frequency. The reception of the radio signal on the ship is a maximum at a given instant. How much later until the next occurrence of maximum reception? (c = 3.00 × 108 m/s) A) 5.1 min B) 3.8 min C) 6.4 min D) 7.7 min E) 8.9 min