In the Compton effect, as the scattering angle increases, the frequency of the X-rays scattered at that angle
A) increases.
B) decreases.
C) does not change.
D) varies randomly.
B
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The apparent "surface" of Jupiter is actually the tops of ________
Fill in the blank(s) with correct word
If Europa turns out to have a subsurface ocean which is a 100 km deep or more, how much water would this correspond to, compared to the amount of water in the Earth's oceans?
A) about the same B) roughly twice as much C) about ten times as much D) roughly half as much
The 1420 MHz (21 cm) radio line generated by neutral hydrogen atoms is a good choice for interstellar communications because
A) it is the easiest radio frequency to generate B) it is the only radio frequency that is not blocked by interstellar matter C) all intelligent civilizations should be aware of its universal significance and would probably also think of sending and receiving signals at this frequency D) it is the only frequency to which radio telescopes can be tuned
A bird can sit harmlessly on a high-voltage wire because
A) the wire is insulated. B) no potential difference is across the birds feet. C) current is inside, not outside, the wire. D) the net charge on a current-carrying wire is zero. E) all of the above