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The anode voltage of photocellis kept fi...

The anode voltage of photocellis 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:

A

B

C

D

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The correct Answer is:
C
When the wavelength `(lamda)` is increased,a stage comes when the value of `lamda` is such that there is no photoelectric current . Hence , the graph given in option ( c) is correct .
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