Download 264-lecture-2015-10

Question: In the photon picture of light,
the light intensity I is related to the
A. magnitude of electric field E.
B. frequency of light f.
C. de Broglie wavelength l.
D. number of photons per second
E. number of photons per second
per area.
Question: When the intensity I of
monochromatic light shining on a
metal surface in vacuum is increased,
the maximum kinetic energy of emitted
electrons
A. increases.
B. stays the same.
C. decreases.
Question: When the frequency f of
light shining on a metal surface in
vacuum is increased, the maximum
kinetic energy of emitted electrons
A. increases.
B. stays the same.
C. decreases.
Question: When the area of the metal
surface is increased for light of fixed
light intensity I and frequency f, the
maximum kinetic energy of emitted
electrons
A. increases.
B. stays the same.
C. decreases.
Question: Monochromatic red light with
intensity I illuminates a metal surface and
produces a certain stopping voltage Vred. If
now monochromatic blue light with intensity
I also illuminates the metal, the new
stopping voltage V will
A. increase
B. stay the same
C. decrease
Question: True or false: the randomness of
the appearance of monoenergetic electrons
on a screen that have passed through a 2slit experiment one-by-one disappears if
one of the slits is closed.
Question: True or false: the collision of a
photon with an electron in the Compton
effect is an elastic collision (energy of the
photon is unchanged).