Grass appears green because
A) it emits green light and absorbs other colors.
B) it absorbs green light and emits other colors.
C) it transmits green light and emits other colors.
D) it reflects green light and absorbs other colors.
D
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Increasing the diameter of a reflecting telescope:
A) increases its light-gathering power. B) decreases its resolving power. C) decreases its magnifying power. D) increases its chromatic aberration.
How did Edwin Hubble measure the distance to the Andromeda Galaxy?
A) He measured its parallax. B) He used Cepheid variables in the Andromeda Galaxy. C) He deduced it from its redshift. D) He used white dwarf supernovae in the Andromeda Galaxy.
Why do we think that quasars are extremely distant?
A. They are very bright. B. They are very faint. C. Their light varies rapidly. D. Their spectra show immense redshifts.
What kind of time can be read directly from a sundial?
A) apparent solar time B) mean solar time C) standard time D) universal time