Photoelectrons are ejected when monochromatic light shines on a freshly-prepared (oxide-free) sodium surface. In order to obtain the maximum increase in the number of electrons ejected per second, the experimenter needs to
a. increase the frequency of the light.
b. increase the intensity of the light.
c. increase the area illuminated by the light.
d. do all of the above. e. do only (b) and (c) above.
E
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What will be an ideal response?
A fatal flaw with Ptolemy's model is its inability to predict the observed phases of
A) the Sun during an eclipse. B) Mars and Jupiter. C) the Moon in its monthly cycle. D) Jupiter and Saturn. E) Mercury and Venus.
A book can slide down a frictionless hill at constant velocity
Indicate whether the statement is true or false
Two objects, one of mass m and the other of mass 2 m, are dropped from the top of a building. If there is no air resistance, when they hit the ground
A. the heavier one will have twice the kinetic energy of the lighter one. B. both will have the same kinetic energy. C. the heavier one will have half the kinetic energy of the lighter one. D. the heavier one will have four times the kinetic energy of the lighter one. E. the heavier one will have one-fourth the kinetic energy of the lighter one.