The size and sign of the charge on an electron is the same as that for:
a. an antiproton.
c. an antineutron.
b. a positron.
d. an antineutrino.
A
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Which of the following statements about black holes is true for an object falling into a black hole?
A) From an outside observer's viewpoint, the object falls quickly through the event horizon. B) From an outside observer's viewpoint, light from the object will become increasingly blueshifted as it approaches the event horizon. C) In the object's reference frame, the object will slow down as it falls and come to a stop just before it reaches the event horizon. D) Once the object crosses the event horizon, it can no longer communicate with anything outside the black hole.
An amount of an ideal gas is taken around the process shown. Which of the following statements about the internal energy of the states is true?
There is almost no hydrogen gas in the atmosphere because
A. it escapes the Earth's gravity B. there is very little hydrogen in the oceans or land C. hydrogen molecules move slower than oxygen and nitrogen D. hydrogen has all sunk to the Earth's core