Modern Physics 6 Question 21
23. 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 photocell varies as follows (a)
(c)
(b)
(d)
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Solution:
- As $\lambda$ is increased, there will be a value of $\lambda$ above which photoelectron will cease to come out. So, photocurrent will be zero.
