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NEET2019PhysicsDual Nature of MatterActual

Assertion : Work function of aluminium is 4.2 eV . Emission of electrons will not be possible if two photons, each of energy 2.5 eV , strike an electron of aluminium. Reason : For photoelectric emission, the energy of each photon should be greater than the work function of aluminium.

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

A. If both assertion and reason are true and reason is the correct explanation of assertion.

Step-by-step solution

Photoelectric effect is a one-to-one process, i.e., only one photon interacts with one electron.

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