The anode voltage of a photocell is kept fixed. The wavelength \lambda of the light falling on the cathode is gradually changed. The plate current I of the photocell varies as follows

Option 1)

Option 2)

Option 3)

Option 4)

Answers (1)

As we learnt in

Saturation Current -

When all the photoelectrons reach the plate A, current becomes maximum known as saturation current.

- wherein

Plate -A - Anode

Plate -C - Cathode

 

 As we change wavelength, the energy of incident photon changes. with increasing value of \lambda, the number of ejected electrons decreases and after a cut off value current becomes zero.

Hence correct graph is 3 


Option 1)

This is an incorrect option.

Option 2)

This is an incorrect option.

Option 3)

This is the correct option.

Option 4)

This is an incorrect option.

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