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:

  1. As $\lambda$ is increased, there will be a value of $\lambda$ above which photoelectron will cease to come out. So, photocurrent will be zero.


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