photoelectric effect threshold

Question

Photoelectric emission occurs only if photon frequency exceeds:

RankGuru · Accepted Answer

The Photoelectric Effect has a critical frequency dependency:
1. **Threshold (Cut-off) Frequency ($f_0$)**: This is the minimum frequency of incident radiation below which no electrons are emitted, regardless of how intense the light is.
2. **Requirement**: The energy of a single photon ($hf$) must be at least equal to the **Work Function** ($\Phi$) of the metal.
$hf \geq \Phi \implies f \geq \frac{\Phi}{h} = f_0$
If $f < f_0$, the photons don't have enough energy to libearte an electron from the metal's surface.

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photoelectric effect threshold

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