The amount of energy needed to remove electrons from the metal surface depends upon:
Correct answer: B. Work function
- A. Work
- B. Work function
- C. Power
- D. Wavelength
Explanation
The energy required to remove an electron from the surface of a metal is known as the work function. It represents the minimum amount of energy needed to overcome the attractive forces between the electron and the metal surface. The formula is given by:ϕ=h⋅fϕ is the work function,h is Planck's constant (6.626×10−34 J⋅s)f is the frequency of the incident light.
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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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