In vacuum, the components of an EM wave are
and 
0. What is the wavelength of the wave?
A. 5.00 m
B. 0.200 m
C. 1.26 m
D. 2.52 m
E. 0.796 m
C. 1.26 m
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The spectra of the coolest stars contain strong absorption features (or lines) of
a. TiO molecules. b. ionized helium. c. helium. d. hydrogen. e. All of the other choices are correct.
Immediately after the Permian extinction event, the carbon dioxide and methane released by volcanism caused the Earth to
A) initiate a snowball Earth phase B) start an ice age C) begin a period of intense global warming D) completely change the composition of its atmosphere
When did the heavy bombardment end?
A) about 4.5 billion years ago B) between about 4.3 and 4.5 billion years ago C) between about 3.8 and 4.0 billion years ago D) exactly 3.95 billion years ago
The ancient Greeks, including Ptolemy, thought that the stars were
A) scattered everywhere between the moon and the inside surface of a large sphere that enclosed the universe. B) scattered throughout infinite space. C) alive. D) scattered everywhere between Earth and the moon. E) fixed to the inside surface of a large sphere that enclosed the universe.