A star whose mass is 5 times larger than the Sun's and whose luminosity is 100 times larger than the Sun's has a main sequence lifetime about
A. 5 times longer than the Sun's.
B. 5 times shorter than the Sun's.
C. 20 times shorter than the Sun's.
D. 100 times shorter than the Sun's.
E. 500 times longer than the Sun's.
Answer: C
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A) radio B) infrared C) visible D) X-ray E) gamma-ray
What process best explains the observed pattern of abundances of elements with atomic numbers between 6 and 20?
A) radioactive decay of nuclei with odd numbers of protons B) fusion reactions with hydrogen nuclei C) fusion reactions with helium nuclei D) fusion reactions with neutrons
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A) less than 1 s. B) about 1 s. C) more than 1 s.
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