What makes a transition from a lower energy state to a higher energy state when a photon is absorbed into an atom?
A) proton
B) neutron
C) electron
D) photon
E) graviton
Ans: C) electron
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A fountain sends a stream of water 20.0 m up into the air. If the base of the stream is 10.0 cm in diameter, what power is required to send the water to this height?
If the objects seen in the past are galaxies, how might they have changed?
A. Galaxies would have had less star formation in the past than at present. B. There were more ellipticals in the past and would be spirals at present. C. Things would have had a larger mass in the past than at present. D. They would have been destroyed by supernovae explosions by the present time. E. The galaxies were more irregular and patchy in the past than they are at present.
Consider a solenoid of length L, N windings, and radius b (L is much longer than b). A current I is flowing through the wire. If the radius of the solenoid were doubled (becoming 2b), and all other quantities remained the same, the magnetic field
A) would remain the same. B) would become twice as strong. C) would become one half as strong.
If a man says to you that he is absolutely certain of some idea, you can conclude that
A) if his idea really is absolutely true then it must be based on scientific reasoning. B) he is wrong. C) he is right. D) he is a fanatic. E) he is not being scientific.