In units of yards, how far from the Big Bang is the Recombination period, when the gas becomes transparent to light?
a. much, much less than a yard b. about a yard
c. about 5 yards d. about 10 yards
a
RATIONALE: Refer to the inset in the Universe Bowl.
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Radio telescopes have poor resolving power because
a. their diameters are so large. b. the energy they receive is not electromagnetic radiation. c. radio waves have long wavelengths. d. a and b e. none of the above
According to the figure below, approximately how many years ago did oxygen finally get to half its current abundance in Earth's atmosphere?
a. 3 billion years ago b. 1 billion years ago c. 0.6 billion years ago d. 0.25 billion years ago e. 0.1 billion years ago
A satellite orbits the earth once every 2.0 h. What is the orbital period of another satellite whose orbital radius is 4.0 times larger?
A. 4.0 h B. 8.0 h C. 16 h D. 64 h E. Some other period (specify)
The planet Neptune is blue in color. How would you expect the spectrum of visible light from Neptune to be different from the visible-light spectrum of the Sun?
A) The two spectra would have similar shapes, except Neptune's spectrum would be missing a big chunk of the red light that is present in the Sun's spectrum. B) The two spectra would have similar shapes, except Neptune's spectrum would be missing a big chunk of the blue light that is present in the Sun's spectrum. C) Neptune's spectrum would peak at a much longer wavelength than the Sun's spectrum. D) There is no way to predict the answer to this question, since planets and stars are made of such different things.