Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: In photoelectric effect, on increasing the intensity of incident light the stopping potential increases.

Correct answer: B. A is false but R is true V_ S = hv-φ e so stopping potential doesn't depend on Intensity I= hv ~A On increasing intensity no. of photons per sec. n increases so the no. of electrons.

JEE Main 20254 AprilMorning Shift

Exam: JEE Main
Year: 2025
Date: 4 April
Shift: Morning Shift
Subject: Physics
Chapter: Dual Nature of Matter

JEE Main 2025 · 4 April · Morning Shift · Physics · Dual Nature of Matter

Given below are two statements: one is labelled as Assertion A and...

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason

\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

Options

ABoth $\mathrm{A}$ and $\mathrm{R}$ are true but $\mathrm{R}$ is NOT the correct explanation of $\mathrm{A}$
B $\mathrm{A}$ is false but $\mathrm{R}$ is true
C $\mathrm{A}$ is true but $\mathrm{R}$ is false
DBoth $\mathrm{A}$ and $\mathrm{R}$ are true and $\mathrm{R}$ is the correct explanation of $\mathrm{A}$

Correct answer

B. $\mathrm{A}$ is false but $\mathrm{R}$ is true

Step-by-step solution

\mathrm{V}_{\mathrm{S}}=\frac{\mathrm{hv}-\phi}{\mathrm{e}}

so stopping potential doesn't depend on Intensity

\mathrm{I}=\frac{\eta \mathrm{hv}}{\mathrm{~A}}

On increasing intensity no. of photons per sec.

n

increases so the no. of electrons.

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