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MHT CET202526 Apr 2025Morning ShiftPhysicsDual Nature of MatterActual

Light of incident frequency 3 times the threshold frequency is incident on a photosensitive material. If the incident frequency is made ( 1 4 )^ th and intensity is tripled then the photoelectric current will

Options

  1. Aincrease
  2. Bdecrease
  3. Cbe ( 1 3 )^ rd
  4. Dbe zero

Correct answer

D. be zero

Step-by-step solution

The photoelectric effect requires the incident light frequency to exceed or equal the material's threshold frequency f₀ for electron emission to occur. Given the initial frequency f₁ = 3f₀ , emission occurs. When the frequency is reduced to f₂ = 1 4 f₁ = 3 4 f₀ , it falls below f₀ , halting emission. Although the intensity is tripled, it cannot overcome the frequency threshold. Thus, the photoelectric current is zero. Final answer: D

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