In Experiments Involving the Setup Shown in Figure Q4

Multiple Choice

In experiments involving the setup shown in figure Q4.1b, the value that the voltmeter displays increases for a short period of time after light starts shining on the cathode, but then quickly settles down to a fixed value. Why?

A) The cathode eventually stops emitting electrons.
B) The kinetic energy of ejected electrons starts out small but quickly reaches a maximum value.
C) The charge difference between the cathode and anode is initially small but with time becomes so large that no electron from the cathode can make it to the anode.
D) The cathode eventually runs out of electrons to emit.
E) Some other explanation (describe) .