Which of the following emits a spectrum very close to a blackbody spectrum?
A. an interstellar cloud
B. the Sun
C. a neon light
Answer: B
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Which of the following kinds of stars is most dense?
a. a supergiant star b. a main sequence star c. a giant star d. a white dwarf e. the sun
If the density of the universe is greater than the critical density, this means that:
A) the universe is expanding at a rate equal to the escape speed of the universe. B) the universe is expanding at a rate less than the escape speed of the universe. C) the universe is expanding at a rate greater than the escape speed of the universe. D) the universe is expanding at a rate equal to the speed of light. E) the universe is expanding at a rate greater than the speed of light.
The Doppler Effect is a phenomenon that allows one to measure an object's
A) temperature. B) radius. C) line-of-sight speed. D) chemical composition.
A bar magnet that holds a chain of nails illustrates
A) magnetic field displacement. B) magnetic induction. C) electromagnetic induction.