Photons of energy 10.25 eV fall on the surface of the metal emitting photoelectrons of maximum kinetic energy 5.0 eV. What is the stopping voltage required for these electrons?
Correct answer: C. 5V
- A. 10V
- B. 8V
- C. 5V
- D. 4V
Explanation
The required equation is given as:Stopping voltage = Kmax/e.Kmax/e=5.0eV/eKmax/e = 5.0 VTherefore, the stopping potential = 5 V.
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Classical physics cannot explain blackbody radiation and related observations, leading to Planck’s quantum theory, in which energy is emitted or absorbed in discrete packets. Photons provide the particle model of light, with energy and momentum linked to frequency and wavelength, including the photoelectric effect and its threshold frequency.
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