To cause photoelectric emission from a metal surface, a minimum amount of energy is required to eject electron. Therefore, frequency of incident radiation must be equal to or greater than a minimum frequency.
Class 12 Physics
Chapter 11 Dual Nature of Radiation and Matter Session 2024-2025.
Why is photoelectric emission not possible at all frequencies?
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Photoelectric emission occurs only if the frequency of incident light exceeds the material’s threshold frequency. Below this frequency, photons lack sufficient energy to overcome the work function, the minimum energy required to eject electrons from the material’s surface, making emission impossible.
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