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

When nonmonochromatic light is utilized in a photoelectric effect experiment, the stopping potential

Options

  1. Adepends on the mean wavelength
  2. Bdepends on the shortest wavelength
  3. Cdoes not depend on the wavelength
  4. Ddepends on the longest wavelength

Correct answer

B. depends on the shortest wavelength

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 wavelength of the incident light and is the work function of the material. The stopping potential V₀ is related to the maximum kinetic energy by eV₀ = K_ . When nonmonochromatic light is used, it consists of a range of wavelengths. The photoelectrons with the maximum kinetic energy are those emitted by the incident photons with the highest energy. Since the energy of a photon is

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