Question
Question: The anode voltage of a photocell is kept fixed. The wavelength l of the light falling on the cathode...
The anode voltage of a photocell is kept fixed. The wavelength l of the light falling on the cathode is gradually changed. The plate current I of the photocell varies as follows-
A
B
C
D
Answer
Explanation
Solution
When wavelength increases then energy of photon decreases so current also decreases, because less electrons are emitted from depth of metal.