How does the energy of the cosmic microwave background compare to the energy radiated by all the stars and galaxies that ever existed?
A) They are very close to being equal.
B) 73% cosmic background, 27% starlight.
C) About ten times more from the Big Bang than from stars and galaxies.
D) The starlight now dominates the background, as your eyes show clearly.
E) We have no way of comparing matter and energy this way.
C
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What sorts of materials serve as moderators in nuclear reactors?
a. water b. boron c. graphite d. concrete
A traveling wave train has wavelength 0.400 m, speed 35.0 m/s. Find the wave frequency
a. 0.0114 Hz b. 43.8 Hz c. 87.5 Hz d. 21.9 Hz e. 55.3 Hz
Cloud dissipation results from
a. an inverted lapse rate. b. hygroscopic nuclei. c. supercooled vapor. d. descending air.
The average translational speed of a nitrogen molecule at room temperature (20°C) is approximately (in m/s)
a. 100. b. 500. c. 300. d. 700. e. 200.