alleryThe threshold frequency $\nu_0$ for a metal is the minimum frequency
Aat which the photocurrent saturates
Babove which the metal melts
Cbelow which no electron is ejected, regardless of intensity
Dof light visible to the human eye
Answer & Solution
Correct answer: C. below which no electron is ejected, regardless of intensity
If $\nu < \nu_0$, photon energy $h\nu < \phi$ — no single photon can eject an electron, no matter how bright the light.
This is the experimental fact that classical wave theory could not explain.
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