NCERT · Class 12 · Physics · Dual Nature of Radiation and MatterWhat is threshold frequency? State its significance.
Step-by-Step Solution
Threshold frequency is defined as the minimum frequency of incident radiation below which no photoelectric emission takes place from a given metal surface, no matter how intense the incident light is. Its significance lies in the fact that it establishes a lower limit of frequency for the photoelectric effect, proving that the phenomenon depends on the frequency of the light rather than its intensity.
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