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MHT CET202615 April 2026Morning ShiftPhysicsDual Nature of MatterActual

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

Options

  1. Abecomes half
  2. Bincreases
  3. Cdecreases
  4. Dis zero

Correct answer

B. increases

Step-by-step solution

According to Einstein's photoelectric equation, the maximum kinetic energy of emitted photoelectrons is given by K_ = hc - where is the incident wavelength and is the work function of the material. The stopping potential V_s is related to the maximum kinetic energy by eV_s = K_ = hc - When the incident wavelength is decreased, the term hc increases. Since the work function remains constant for a given material, the maximum kinetic energy K_ of the photoelectrons increases. Consequently, the stopping potential V_s a

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