Question

In a particular experiment to study the photoelectric effect, the frequency of the incident light and the temperature of the metal are held constant. Assuming that the light incident on the metal surface causes electrons to be ejected from the metal, what happens if the intensity of the incident light is increased?

Answer 1

Step-by-step explanation:

When a light beam of suitable frequency falls on metal surface, the electrons from the metal surface ejects, this phenomenon is called photo electric effect and the particular minimum frequency is called cut off frequency or threshold frequency.

When the intensity of incident radiation increases, the photo electric current also increases.

Answer 2

The kinetic energy of the ejected electrons increases.

Step-by-step explanation:

As we know that electrons are only ejected from a metal surface if the frequency of the incident light increases the work function of the metal. If the frequency of the incident light is less than the work function of the metal no matter how intense the beam the electrons will not be ejected from the surface.

Using conservation of energy principle we have

`E_(incident)=h\\u +(1)/(2)mv^(2)`

If we increase the intensity of incident light the term on the LHS of the above equation increases this increase appears in the kinetic energy term in RHS of the equation since
`h* \\u` remains constant.