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A light of amplitude \( A \) and wavelength \( \lambda \). is incident on a metallic surface, then saturation current flows is proportional to (assume cut off wave length \( =\lambda 0 \quad \) ) -
A \( A^{2} \), if \( \lambda\lambda_{0} \)
B \( A^{2} \), if \( \lambda\lambda_{0} \)
\( \mathrm{C} A \), if \( \lambda\lambda_{0} \)
\( \mathrm{D} A \), if \( \lambda\lambda_{0} \)
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