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(D) Assertion $(A)$ is true. By applying a sufficiently negative potential (stopping potential) to the collector plate relative to the emitter, the mo

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Both $(A)$ and $(R)$ are true but $(R)$ is not the correct explanation of $(A).$

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(D) Assertion $(A)$ is true. By applying a sufficiently negative potential (stopping potential) to the collector plate relative to the emitter, the most energetic photoelectrons are repelled, suppressing the photoelectric current.Reason $(R)$ is true. The stopping potential $V_0$ is given by Einstein's photoelectric equation: $eV_0 = h
u - \phi_0$, where $V_0 = (h/e)
u - (\phi_0/e)$. This shows that the stopping potential varies linearly with the frequency $
u$ of incident radiation.However, the reason $(R)$ explains the nature of the stopping potential, but it does not directly explain why applying a negative potential suppresses the emission (which is due to the electrostatic repulsion of electrons). Therefore, $(R)$ is not the correct explanation of $(A)$.

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