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NEETPhysicsDual Nature of Matter

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): For two different photosensitive metals A and B, where the work function of metal B is greater than that of metal A, the graph of stopping potential versus incident frequency for metal B intersects the frequency axis at a lower value than metal A. Reason (R): The slope of the stopping potential ver

Options

  1. ABoth Assertion and Reason are true and Reason is the correct explanation of Assertion.
  2. BBoth Assertion and Reason are true but Reason is not the correct explanation of Assertion.
  3. CAssertion is true but Reason is false.
  4. DAssertion is false but Reason is true.

Correct answer

D. Assertion is false but Reason is true.

Step-by-step solution

From Einstein's photoelectric equation: eV_s = h - V_s = ( h e ) - e The graph of stopping potential ( V_s ) versus incident frequency ( ) is a straight line. The slope of this graph is h e , which is a universal constant and independent of the material. Thus, the Reason (R) is true. The intercept on the frequency axis represents the threshold frequency ( ₀ ), which is given by ₀ = h . Since the work function of metal B is greater than that of metal A ( _B > _A ), metal B will have a higher threshold frequency ( _

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