The maximum K.E of emitted photoelectrons depend on
Correct answer: B. Frequency of the incident light
- A. Intensity of the incident light
- B. Frequency of the incident light
- C. Temperature of the photosensitive surface
- D. None
Explanation
Intensity of the incident light: While the intensity of light can affect the number of photoelectrons emitted, it does not affect the maximum kinetic energy (KE) of each emitted electron.Frequency of the incident light: According to Einstein's photoelectric effect equation, the maximum kinetic energy (KE_max) of emitted photoelectrons is directly proportional to the frequency (f) of the incident light:KE_max = h * f - W_0where:h is Planck's constantW_0 is the work function of the material (minimum energy required to eject an electron)Therefore, increasing the frequency of the incident light increases the maximum kinetic energy of the emitted photoelectrons.Temperature of the photosensitive surface: The temperature of the photosensitive surface does not influence the maximum kinetic energy of emitted photoelectrons as long as the temperature is low enough to avoid significant thermal emission (electrons being ejected due to thermal energy instead of light).Therefore, the frequency of the incident light is the primary factor determining the maximum kinetic energy of emitted photoelectrons
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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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