When the adjustable mirror on the Michelson interferometer is moved 20 wavelengths, how many fringe pattern shifts would be counted?
a. 5
b. 10
c. 20
d. 40
e. 80
e
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Which of the following gases was present in the smallest amounts in early atmosphere of the Earth?
A) hydrogen (H2) B) nitrogen (N2) C) carbon dioxide (CO2) D) oxygen (O2)
Which of the following statements best describes the general pattern of composition among the four jovian planets?
a. Jupiter is made mostly of hydrogen and helium, while the other three jovian planets are made mostly of hydrogen compounds. b. Jupiter is made mostly of hydrogen, Saturn is made mostly of helium, Uranus is made mostly of hydrogen compounds, and Neptune is made mostly of rock. c. Uranus and Neptune contain relatively more rock and hydrogen compounds than Jupiter and Saturn. d. All four planets have essentially the same composition.
The density of metals is ______________relative to their atomic weights, in comparison to covalently bonded materials with the same interatomic spacing.
Fill in the blank(s) with the appropriate word(s).
Suppose two stars are identical except that one is twice as far away from us as the other. Which statement is true?
A) Both stars have the same apparent brightness, but the luminosity of the closer star is four times as great as that of the more distant star. B) Both stars have the same luminosity, but the apparent brightness of the closer star is twice as great as that of the more distant star. C) Both stars have the same luminosity, but the apparent brightness of the more distant star is four times as great as that of the closer star. D) Both stars have the same luminosity, but the apparent brightness of the closer star is four times as great as that of the more distant star.