JEE Mains · Physics · STD 12 - 11. Dual nature of radiation and matter
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Emission of electrons in photoelectric effect can be suppressed by applying a sufficiently negative electron potential to the photoemissive substance.
Reason (R) : A negative electric potential, which stops the emission of electrons from the surface of a photoemissive substance, varies linearly with frequency of incident radiation.
In the light of the above statements, choose the most appropriate answer from the options given below :
- A (A) is false but (R) is true
- B (A) is true but (R) is false
- C Both \((\mathbf{A})\) and \((\mathbf{R})\) are true and \((\mathbf{R})\) is the correct explanation of \((\mathbf{A})\)
- D Both \((\mathbf{A})\) and \((\mathbf{R})\) are true but \((\mathbf{R})\) is not the correct explanation of \((\mathbf{A})\)
Answer & Solution
Correct Answer
(D) Both \((\mathbf{A})\) and \((\mathbf{R})\) are true but \((\mathbf{R})\) is not the correct explanation of \((\mathbf{A})\)
Step-by-step Solution
Detailed explanation
Assertion (A) is true because a sufficiently negative potential can repel and stop the emitted electrons from leaving the surface. Reason (R) is also true because the stopping potential \(V_{\text {stop }}\) varies linearly with the frequency \(\nu\) of the incident light…
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