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MHT CET202120 Sep 2021Evening ShiftPhysicsDual Nature of MatterActual

When a photosensitive surface is irradiated by light of wavelength ' ₁ ' and ' ₂ ', maximum kinetic energies of emitted photoelectrons are ' E₁ ' and ' E₂ ' respectively. The work function of photosensitive surface is

Options

  1. A( ₁ E₁- ₂ E₂ ) ( ₂- ₁ )
  2. B( ₁ E₁+ ₂ E₂ ) ( ₂- ₁ )
  3. C( ₁ E₂- ₂ E₁ ) ( ₂- ₁ )
  4. D( ₁ E₂+ ₂ E₁ ) ( ₂- ₁ )

Correct answer

A. ( ₁ E₁- ₂ E₂ ) ( ₂- ₁ )

Step-by-step solution

aligned & E ₁= hc ₁ - W & E ₂= hc ₂ - W & E ₁ ₁+ W ₁= E ₂ ₂+ W ₂ & ~W = E ₁ ₁- E ₂ ₂ ₂- ₁ aligned

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