Question

Draw the graphs showing variation of the photoelectric current with applied voltage for two incident radiations equal frequency and different intensities. Mark the graph for radiation of higher intensity.

Answer 1

Hint: In the process of photoelectric effect, the electrons from the metal surface are made to emit with the use of the light radiations which incident on it. These electrons are used as the current and it is known as photo electric current.

Complete step by step solution:
The radiation incident on the metal surface influences the output photo current of the metal. The suitable radiation produces the photo current which is directly proportional to the intensity of the radiation that incident on the surface of the metal. Intensity is defined as the power of the incident light that falls on the metal surface. The frequency is the number of times the repeated event occurs over a given time. The below graph represents the variation of the photocurrent of the two equal voltages with the same frequency but the different intensities.



Hence the graph shows that the radiations of the same frequency but the different intensity may produce the different photocurrent from the metal. Hence the intensity of the radiation has the most influence in the production of the photocurrent.

Note: The point at which the photocurrent is maximum, it is called as the saturation current and point in which the photo current becomes zero, it is called as the cut- off voltage. The cut- off voltage is also called stopping potential.