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MHT CET202210 Aug 2022Morning ShiftPhysicsDual Nature of MatterActual

Threshold frequency for a metal is 15 10¹⁴ ~Hz . The light of wavelength 6000 falls on the metal surface. Then photoelectrons [velocity of light in air, c=3 10^8 ~m / s ]

Options

  1. Acome out with zero velocity.
  2. Bcome out with velocity 3 10^6 ~m / sa
  3. Cwill not be emitted
  4. Dare emitted with velocity c

Correct answer

C. will not be emitted

Step-by-step solution

Frequency of light of wavelength =6000 ~A ^0 is f= c = 3 10^8 6000 10⁻¹⁰ ~Hz =5 10¹⁴ ~Hz which is less than the given threshold frequency. Hence, no photoelectric emission takes place.

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