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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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
Inside the nucleus, the weakest of the four fundamental forces is
A) the electromagnetic force. B) the gravitational force. C) the weak nuclear force. D) the strong nuclear force.
The hang time of an athlete who moves horizontally 2.0 m during a 1.25-m-high jump is
A) less than 1 s. B) about 1 s. C) more than 1 s.
At which wavelength range is there no current or planned space observatory?
A) radio B) infrared C) visible D) X-ray E) gamma-ray