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MHT CET2016PhysicsDual Nature of Matter

Light of wavelength λ which is less than threshold wavelength is incident on a photosensitive material. If incident wavelength is decreased so that emitted photoelectrons are moving with same velocity then stopping potential will

Options

  1. Aincrease
  2. Bdecrease
  3. Cbe zero
  4. Dbecome exactly half

Correct answer

A. increase

Step-by-step solution

According to photoelectric equation h c λ - ϕ = E where E = p 2 2 m ( K . E ) If E is constant ⇒ t h e n 1 λ ∝ ϕ If we decrease the wavelength λ , then stopping potential ϕ will increase such that h c λ - ϕ = constant

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