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The photoelectric emission from the surface of a metal starts only when the light incident on the surface has a certain

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minimum frequency.

minimum intensity.

minimum wavelength.

minimum speed.

answer is A.

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Detailed Solution

The minimum frequency required for the emission of electrons is called threshold frequency below which no photoelectron is emitted.

Hence, photoelectric emission from the surface of the metals starts only when light incident on the surface has minimum frequency.

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