Amount of K.E. of emitted photoelectrons depends upon:
Correct answer: C. Frequency of incident light
- A. Temperature of surface
- B. The intensity of incident light
- C. Frequency of incident light
- D. All of the above
Explanation
In the photoelectric effect, the amount of kinetic energy of emitted photoelectrons depends on the frequency of the incident light. This relationship is expressed by the equation: K.E = hf - W According to this equation, the kinetic energy of the emitted photoelectrons is determined by the difference between the energy of the incident photons (hf) and the work function of the material (W).
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About Dawn of Modern Physics
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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