Dual Nature of Matter

JEE Main level, single correct, medium

101 of 200

Question 101 of 200

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R\mathrm{R}
Assertion A: In photoelectric effect, on increasing the intensity of incident light the stopping potential increases.
Reason R : Increase in intensity of light increases the rate of photoelectrons emitted, provided the frequency of incident light is greater than threshold frequency.
In the light of the above statements, choose the correct answer from the options given below

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Answer: (B) A\mathrm{A} is false but R\mathrm{R} is true

VS=hv−ϕe\mathrm{V}_{\mathrm{S}}=\frac{\mathrm{hv}-\phi}{\mathrm{e}}
so stopping potential doesn't depend on Intensity
I=ηhv A\mathrm{I}=\frac{\eta \mathrm{hv}}{\mathrm{~A}}
On increasing intensity no. of photons per sec. nn increases so the no. of electrons.

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