For a star of 10 solar masses, its main sequence life span will be:
A) ten times longer than our Sun's.
B) about the same as the Sun's.
C) only a tenth of the Sun's.
D) about a hundred times less than the Sun's.
E) only 1/1000th of the Sun.
E
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The "half-life" of a large collection of radioactive nuclei is
A. larger for heavy nuclei than for lighter nuclei. B. the number of nuclei that remain after 1 second. C. the time for half of the collection to decay. D. the number of nuclei that decay in 1 second.
The form of radiation from naturally radioactive uranium that has the largest mass is ________ rays.
Fill in the blank(s) with the appropriate word(s).
A mass oscillates on the end of a spring, both on Earth and on the Moon. Where is the period the greatest?
A) Earth B) the Moon C) the same on both Earth and the Moon D) Cannot be determined from the information given.
Neptune was discovered by irregularities in the orbit of
A) Jupiter. B) Saturn. C) Uranus. D) Pluto. E) Earth.