A beam of light falling on a metal surface is causing electrons to be ejected from the surface. If we now double the frequency of the light,
which of the following statements are correct? (There could be more than one correct choice.)
A) The kinetic energy of the ejected electrons doubles.
B) The speed of the ejected electrons doubles.
C) The number of electrons ejected per second doubles.
D) Twice as many photons hit the metal surface as before.
E) None of the above things occur.
E
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A) the equator B) the North or South Pole C) between the Arctic Circle and the tropic of Cancer D) between the Antarctic Circle and the tropic of Capricorn E) There will always be circumpolar stars wherever you live.
Energy
a)is the same thing as power. b)is a vector quantity. c)is measured in the same units as work. d)has the same units of velocity. ?
In everyday language, speed and velocity are synonyms, but in physics
A. velocity has only magnitude. B. speed has only direction. C. velocity has magnitude and direction. D. speed has magnitude and direction. E. velocity has only direction.
One piece of evidence against the possibility of water on Mars is:
A) the current lack of water on Mars. B) the fact that the polar ice caps are made of carbon dioxide ice. C) the volcanic activity on Mars. D) the few carbonate rock layers that would have formed on the bottoms of oceans. E) the "hydrated" chemical compounds found on surface rocks all over the planet.