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The photoelectric threshold wavelength of a certain metal is $3000 \overset{0}{A}$ . If the radiations of $2000 \overset{0}{A}$ is incident on the metal

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Protons will be emitted

Electrons will be emitted

Positrons will be emitted

Electrons will not be emitted

answer is B.

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Detailed Solution

$λ < λ_{0} (ie wavelength of incident light must be less than threshold wavelength for photoelectric effect)$

Electrons will be emitted

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