In the Lighthouse Model,
A) the star literally turns on and off like a lighthouse beacon.
B) all pulsars must have their poles pointed directly toward us.
C) if the beam sweeps across us, we will detect a pulse of radiation.
D) the period of pulsation must speed up as the neutron star continues collapsing.
E) the period of pulsation slows down due to the drag of the remnant on its field.
C
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A piece of soft wood floats in water with half of its volume submerged. If it is placed in mercury which has a density about 13.6 times that of water, it will float ________ (higher, lower, the same) compared with floating in water.
Fill in the blank(s) with the appropriate word(s).
One good argument in favor of nuclear power over coal power is that
A) the high operating temperature of nuclear plants makes this the most efficient type of generating plant. B) whereas we are running out of coal, there is a very large supply of uranium to supply nuclear power plants. C) nuclear power does not contribute to the ozone problem. D) nuclear plants do not produce any waste heat. E) nuclear power does not contribute to the global warming problem.
PET is an abbreviation for
A) photon-electron tunneling. B) positron emission tomography. C) photon emission tunneling. D) photon emission tomography. E) pericranial electromagnetic technique.
The sun radiates at a power of
How long does it take for the sun to lose an amount of mass equal to the mass of the Earth 
Choose the first answer that is correct.
A. less than one year
B. less than 1000 years
C. 
D. 
E. 