The anode voltage of a photocell is kept fixed. The wavelength of the light falling on the cathode is gradually changed. The plate current of the photocell varies as follows
Option 1) | Option 2) |
Option 3) | Option 4) |
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 , 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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