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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 a given photosensitive material, if the wavelength of incident light is increased beyond a certain maximum value, photoelectric emission stops. Reason (R): The work function of a photosensitive material is a characteristic property of the material and is independent of the intensity of incident

Options

  1. ABoth Assertion and Reason are correct and Reason is the correct explanation for Assertion
  2. BBoth Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  3. CAssertion is correct but Reason is incorrect
  4. DAssertion is incorrect but Reason is correct

Correct answer

B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

Step-by-step solution

Assertion (A) is correct: The maximum wavelength that can cause photoelectric emission is called the threshold wavelength. If the incident wavelength exceeds this value, the energy of the incident photons ( E = hc ) becomes less than the work function of the material, and photoelectric emission stops. Reason (R) is also correct: The work function is indeed a characteristic property of the given material (depending on its nature and surface impurities) and does not depend on the intensity of the incident light. Howe

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