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NEET2017PhysicsDual Nature of MatterActual

Assertion : As work function of a material increases by some mechanism, it requires greater energy to excite the electrons from its surface. Reason : A plot of stopping potential (V_s ) versus frequency (v) for different metals, has greater slope for metals with greater work functions.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion.
  3. CIf assertion is true but reason is false.
  4. DIf both assertion and reason are false.

Correct answer

C. If assertion is true but reason is false.

Step-by-step solution

As eV =h ~s -WV_ s = ( h e ) v - ( W e ) For V_ s versus v graph, slope = h e = constant.

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