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MHT CET202013 Oct 2020Morning ShiftPhysicsDual Nature of MatterActual

Threshold frequency for a metal is 15 10¹⁴ ~Hz . The light of wavelength 6000 Å falls on the metal surface. Which one of the following statements is correct? [velocity of light, . c =3 10⁸ ~m / s ]

Options

  1. Aphotoelectrons are emitted with velocity c.
  2. Bphotoelectrons come out with velocity 3 10⁶ ~m / s
  3. Cphotoelectrons come out with zero velocity.
  4. Dphotoelectrons will not be emitted.

Correct answer

D. photoelectrons will not be emitted.

Step-by-step solution

aligned v₀ &=15 10¹⁴ ~Hz ₀= C v &= 3 10⁸ 15 10¹⁴ &=2 10⁻⁷ ~m &=2000 Å &=6000 Å aligned Since > ₀ , photo electrons will not be emitted

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