In a greenhouse, electromagnetic energy in the form of visible light enters the glass panes and is absorbed and then reradiated. What happens to this reradiated electromagnetic radiation from within the greenhouse?
a. 100% returns to the atmosphere.
b. It's partially blocked by glass.
c. It's transformed into ultraviolet upon striking the glass.
d. It's reflected as visible light upon striking the glass.
B
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The period-luminosity law of pulsating variable stars indicates that
A. the period of pulsation is independent of luminosity. B. the more slowly a star pulsates, the more luminous it is. C. the faster a star pulsates, the more luminous it is. D. None of these choices is correct.
When electric current is flowing in a metal, the electrons are moving
A) at nearly the speed of light. B) at the speed of light. C) at the speed of sound in the metal. D) at the speed of sound in air. E) at none of the above speeds.
Which terrestrial planet has the most moons?
A. Earth B. Mars C. Mercury D. Venus
A ball rolls off the edge of a table. The horizontal component of the ball's velocity remains constant during its entire trajectory because
A) the ball is not acted upon by any force. B) the net force acting on the ball is zero. C) the ball is not acted upon by a force in the horizontal direction. D) the ball is not acted upon by a force in the vertical direction. E) None of the other choices is correct.