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Concepts Of Physics MCQ Edition [Volume 2]PhysicsPhotoelectric Effect and Wave–Particle Duality

In an experiment on the photoelectric effect, if the wavelength of the incident light is doubled,

Options

  1. Aphotoelectric emission may or may not occur
  2. Bthe stopping potential will increase
  3. Cthe stopping potential will decrease
  4. Dphotoelectric emission will not occur

Correct answer

C. the stopping potential will decrease

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 work function of the metal and V_s is the stopping potential such that K_ = eV_s . When the wavelength of the incident light is doubled, the new energy of the incident photon becomes E' = hc 2 = E 2 . If E 2 , photoelectric emission will continue. Thus, photoelectric emission may or may not occur. If emission continues, the new stopping potential V_s' is given by eV_s' = E 2 - =

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