The anode voltage of a photocell is kept fixed. The wavelength \( \...

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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 :
\( \mathrm{P} \)
(A)
(B)
W
(C)
(D)
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