When it comes near a heavy nucleus, a gamma ray, which is a high energy photon, can "disappear," and in its place there will be produced an electron and a positron, which both have mass. This pair production is an example of
a. time dilation.
b. length contraction.
c. the equivalence of mass and energy.
d. the principle of relativity.
e. none of the above.
c
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The surface of Mercury looks very similar to ________
Fill in the blank(s) with correct word
A wave pulse traveling to the right along a thin cord reaches a discontinuity where the rope becomes thinner and lighter. What is the orientation of the reflected and transmitted pulses?
A) both are right side up B) the reflected pulse returns right side up while the transmitted pulse is inverted C) the reflected pulse returns inverted while the transmitted pulse is right side up D) both are inverted E) It is impossible to predict.
After a rock thrown straight up reaches the top of its path and then falls a short distance, its acceleration is (neglect air resistance)
A) greater than at the top of its path. B) less than at the top of its path. C) the same as at the top of its path.
Why is Neptune denser than Saturn?
A) Neptune has a higher proportion of hydrogen compounds and rocks than Saturn. B) Neptune has a larger mass and stronger gravity than Saturn. C) Neptune has a much more massive core than Saturn. D) Neptune has a greater proportion of helium compared to hydrogen than Saturn.