The lunar surface cools after the Sun sets. This is an example of
a. heat conduction.
b. heat convection.
c. heat radiation.
d. thermal expansion.
e. none of the above.
c
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Quarks are held together by the color force. Electrons are made of quarks
a. True b. False Indicate whether the statement is true or false
If the theory that novae occur in close binary systems is correct, then novae should
a. produce synchrotron radiation. b. occur in regions of star formation. c. not occur in old star clusters. d. all be visual binaries. e. repeat after some interval.
The absolute temperature of an ideal gas is directly proportional to which of the following quantities?
A) the average speed of its molecules B) the average momentum of its molecules C) the average kinetic energy of its molecules D) the mass of its molecules E) It is proportional to all of the above quantities.
Main-sequence stars have about the same density as the Sun but giant stars have very low densities
a. True b. False Indicate whether the statement is true or false