The anode voltage of a photocell is kept fixed. The wavelength of the light falling on the cathode is
gradually changed. The plate current I of the photocell varies as follows: (AIEEE 2006; 3/180]
(1)
(3) 1
(4)
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Explanation:
lemda will decrease, k max will also decreased,
so, current should decrease and finally fall to zero when initial lemda is achieved.
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