The luminosity of a Seyfert galaxy varies with a regular period of months or years
a. True
b. False
Indicate whether the statement is true or false
False
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How should 
for an ideal gas?
A. 
B. 
C. 
D. One cannot tell without careful calculation.
The light radiated from the Sun's surface reaches Earth in about 8 minutes, but the energy of that light was released by fusion in the solar core about
A) a few hundred thousand years ago. B) 3 days ago. C) 100 years ago. D) 1,000 years ago.
A circus diver drops from a high pole into water far below. When he is halfway down
A) his potential energy is halved. B) he has gained an amount of kinetic energy equal to half his initial potential energy. C) his kinetic energy and potential energy are equal. D) all of the above E) none of the above
Why argument did the Aristotelian school present to reject the concept of Aristarchus that the Earth could be revolving around the Sun? Why was it wrong?
What will be an ideal response?