Threshold frequency (f_0)
Definition
The threshold frequency is the minimum frequency of light required to eject electrons from a metal surface in the photoelectric effect.
Analogy
Imagine a locked door that requires a specific key to open. The threshold frequency is like the minimum frequency of sound vibrations needed to unlock the door and allow electrons to escape from the metal surface.
Related terms
Photoelectric effect: The phenomenon where electrons are emitted from a material when it absorbs photons with sufficient energy.
Work function: The minimum amount of energy required to remove an electron from a material's surface.
Photon: A particle of light that carries energy proportional to its frequency.
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