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

Physics & Space Science

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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.

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science

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.

Physics & Space Science