When a clean surface of potassium metal is exposed to blue light, electrons are emitted. If the intensity of the blue light is increased, which of the following will also increase?
A) the number of electrons ejected per second
B) the threshold frequency of the ejected electrons
C) the maximum kinetic energy of the ejected electrons
D) the time lag between the absorption of blue light and the start of emission of the electrons
E) none of these

Question

Quizplus · Accepted Answer

Increasing the intensity of light increases the number of photons hitting the surface per second, which in turn increases the number of electrons ejected per second. The threshold frequency, maximum kinetic energy of ejected electrons, and time lag are properties that depend on the frequency of the light, not its intensity.

When a Clean Surface of Potassium Metal Is Exposed to Blue