When the air of a fully-inflated party balloon quickly escapes, its temperature
A) drops.
B) rises.
C) remains unchanged.
D) none of the above
Answer: A
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________ are hot compact stars whose mass is comparable to the Sun's and size to Earth's.
A. Neutron stars B. Pulsars C. White dwarfs D. Black holes
For radio transmission, which has the higher frequency?
A) carrier wave B) sound wave C) neither of these
Which equation represents the overall nuclear fusion process of the Sun?
a. 4H => 8He + energy b. 2 1H => 1He + energy c. 4 1H => 2 1He – energy d. 4 1H => 4He + energy e. 4 4H => 4He – energy
The last fusion product possible in stars is ________ because ________.
A. carbon; no stars are hot enough in their cores to fuse carbon nuclei B. iron; no stars are hot enough in their cores to fuse iron nuclei C. iron, fusing iron nuclei absorbs energy; it does not liberate it D. lead, fusing lead nuclei absorbs energy; it does not liberate it