The number of photoelectrons emitted from metal depends upon:
Correct answer: A. Intensity of incident light
- A. Intensity of incident light
- B. Energy of incident light
- C. Wavelength of incident light
- D. Frequency of incident light
Explanation
The intensity of incident light refers to the brightness or the amount of light energy falling on the metal surface per unit area per unit time. According to the photoelectric effect, the number of photoelectrons emitted from a metal surface depends directly on the intensity of the incident light. Higher-intensity light means more photons, thus more photoelectrons are emitted. However, the energy of individual photons remains the same.
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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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