From a metallic surface photoelectric emission is observed for frequencies $v_{1}$ and $v_{2}$ ($v_{1}>v_{2}$) of the incident light. The maximum values of the kinetic energy of the photoelectrons emitted in the two cases are in the ratio $1:x$. Hence the threshold frequency of the metallic surface is
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Logic Tip: Threshold frequency is a characteristic property of the metal surface and does not depend on the incident light frequency.