The frequency and work function of an incident photon are v and $ϕ_{0}$ . If $v_{0}$ is the threshold frequency then necessary condition for the emission of photo electron is

$v < v_{0}$

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$v = \frac{v_{0}}{2}$

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$v \geq v_{0}$

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$N o n e o f t h e s e$

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The frequency and work function of an incident photon are v and ϕ0. If v0 is the threshold frequency then necessary condition for the emission of photo electron is