Question

Which of the graphs shown below does not represent the relationship between incident light and the electron ejected from the metal surface?

• A.
• B.
• C.
• D.

Answer 1

The correct option is C

We know, number of electrons ejected depends on the intensity of light, if the incident light has a frequecy more than threshold frequency.

Again Kinetic energy of electrons depends on frequency of the incident radiation. Hence if we plot a graph of KE of electrons versus intensity of light, we will get a parallel line to the intensity of light as shown in the option (b).

Kinetic energy depends upon two factors frequency as well as threshold frequency. Hence it is clear that it will be a straight line curve but with some intercept, it cannot be the one which directly passes through origin. Hence out of all the graphs, the graph which does not represent the relationship between incident light and the electron ejected from the metal surface is option (c)