Consider the spectra of the four objects shown beneath the laboratory spectrum. Based on these spectra, what can you conclude about Object 1?
A) It is moving away from us.
B) It is composed mostly of hydrogen, helium, and iron.
C) It is a star with a thin upper atmosphere.
D) It is a hot object, with a temperature above 1 million K.
E) It is moving toward us.
A) It is moving away from us.
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In the hypothetical atomic interaction shown in figure C9.13, suppose that initially the system’s kinetic energy is 
at an initial separation of 0.1 nm. About how much energy would we have to add to the system for the atoms to fly off to infinite separation?
A. 1 × 10-21 J B. 6 × 10-21 J C. 11 × 10-21 J D. 16 × 10-21 J E. None. The atoms will do so without adding energy.
This diagram represents a person's local sky. What does the red semicircle represent?
A) the horizon B) the meridian C) the zenith D) the celestial equator
Planets found in the habitable zone of other stars
A) are all rocky planets, like the terrestrial planets in our solar system. B) are all jovian planets. C) include some Earths and super-Earths. D) include hot Jupiters. E) have been demonstrated to be barren of all life.
A temperature difference of 9.0 Celsius degrees is equal to a Fahrenheit temperature difference of
A. 5.0 Fahrenheit degrees. B. 9.0 Fahrenheit degrees. C. 16 Fahrenheit degrees. D. 37 Fahrenheit degrees. E. 41 Fahrenheit degrees.