An 84-kW AM radio station broadcasts at 1000 kHz . How many photons are emitted each second by the transmitting antenna? (h = 6.626 × 10-34 J • s)
A) 1.3 × 1032
B) 2.9 × 1024
C) 6.3 × 1012
D) 1.4 × 1015
A
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Today the Sun is in the middle of the constellation Virgo. Therefore, tomorrow the Sun will be in the constellation
A) Libra.
B) Virgo.
C) Leo.
D) Sagittarius.
Compared to the planets in our own solar system, exoplanets have
A) a much narrow range of composition B) a much wider range of compositions C) an almost identical range of compositions D) completely different compositions
A telescope is constructed with two lenses separated by a distance of 25 cm. The focal length of the objective is 20 cm. The focal length of the eyepiece is 5 cm. Calculate the magnitude of the angular magnification of the telescope
a. 6 b. 4 c. 8 d. 10 e. 5
A particular material has an index of refraction of 2.75 . What percent of the speed of light in vacuum is the speed of light in the material?
a. 36% b. 10% c. 8% d. 89%