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A metallic surface ejects electrons. When exposed to green light of intensity I but no photoelectrons are emitted,when exposed to yellow light of intensity I.It is possible to eject electron from the same surface by
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yellow light of same intensity which is more than I
$\lambda_{\text {red }}>\lambda_{\text {violet }}$
As wavelength $\lambda$ less than that of yellow colour and hence can initiate photoelectric effect irrespective of intensity.
As wavelength $\lambda$ less than that of yellow colour and hence can initiate photoelectric effect irrespective of intensity.
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