In Einstein's photoelectric equation hv =ϕ +eV, the kinetic energy of photoelectrons is:
Correct answer: B. K.Emax = -eV
- A. K.Emax=p+eV
- B. K.Emax = -eV
- C. K.Emax = -hv
- D. K.Emax = hv - φ
- E. K.Emax = hv-eVo
Explanation
The equation K.Emax=−eV refers to the maximum kinetic energy (K.E) of electrons in the context of the photoelectric effect or electron emission.
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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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