A sound wave and a light wave have identical
A) speeds.
B) wavelengths.
C) frequencies.
D) all of the above
E) none of the above
Answer: E
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If we could see our own galaxy from 2 million light-years away, it would appear ________
A) as a faintly glowing band of light stretching all the way around the sky B) like a single, dim star C) as a flattened disk with a central bulge and spiral arms D) to fill the sky with widely spaced stars
Why do we feel type O and B stars are poor candidates for extraterrestrial life?
A) They do not have a habitable Zone. B) They don't produce enough yellow light. C) Their lifetime is too short. D) They don't produce a planetary system. E) Their habitable zone lies too close to the star.
An ideal gas is allowed to undergo a free expansion. If its initial volume is V1 and its final volume is V2, the change in entropy is
a. nR ln (V2/V1) b. nRT ln (V2/V1) c. nk ln (V2/V1) d. 0 e. nR V2/V1
The graph of position versus time is given for a train. What can you say about the train’s motion from time t1 to time t2?
A. it is moving with constant velocity
B. it is not moving
C. it is moving with a constant negative velocity
D. it is accelerating
