The emission of light of lower frequency after illumination by a higher frequency is referred to as
A)
absorption.
B)
stimulated emission.
C)
coherence.
D)
phosphorescence.
E)
fluorescence.
E
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The circular shape of the Earth's shadow on the Moon during a lunar eclipse suggested to the Greeks that the Earth was
A) cylindrical in shape B) at the center of the Universe C) flat D) spherical in shape
Suppose that an object is moving with a constant velocity. Make a statement concerning its acceleration
A) The acceleration must be constantly increasing. B) The acceleration must be constantly decreasing. C) The acceleration must be a constant non-zero value. D) The acceleration must be equal to zero. E) A statement cannot be made without additional information.
A clarinet behaves like a tube closed at one end. If its length is 1.0 m, and the velocity of sound is 344 m/s, what is its fundamental frequency (in Hz)?
a. 264 b. 140 c. 86 d. 440 e. 172
As a 70-kg person stands at the seashore gazing at the tides (which are caused by the Moon), how large is the gravitational force exerted on that person by the Moon?
The mass of the Moon is 7.35 × 1022 kg, the distance to the Moon is 3.82 × 108 m, and G = 6.67 × 10-11 N ? m2/kg2. A) 0.24 N B) 0.024 N C) 0.0024 N D) 0.00024 N