First slide

Photo Electric Effect

Question

The anode voltage of a photo cell is kept fixed. The wavelength $λ$ of the light falling on the cathode is gradually changed. The plate current I of the photo cell varies as follows

Moderate

A
B
C
D

Solution

As $λ$ decreases, frequency increases and hence the speed of photoelectrons increases. The chance of photo electron to meet the anode increases and hence photo electric current increases

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