A metal surface has threshold frequency

PHYSICS · Subjective · A Level · Physics · Particles and radiation · Particles and radiation

Problem

A metal surface has threshold frequency 5.0×1014 Hz5.0\times10^{14}\,\text{Hz}. Light of frequency 4.0×1014 Hz4.0\times10^{14}\,\text{Hz} is incident on it with very high intensity. Explain why no photoelectrons are emitted in this case.

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