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The maximum velocity of an electron by light of wavelength $γ$ incident on the surface of a metal of work function $ϕ$ is
${[\frac{2 (h c - γ ϕ)}{m γ}]}^{1 / 2}$
${[\frac{2 (h c + γ ϕ)}{m γ}]}^{- 1 / 2}$
$\frac{2 (h c + γ ϕ)}{m}$
${[\frac{2 (h γ - ϕ)}{m}]}^{1 / 2}$

A

{[\frac{2 (h c - γ ϕ)}{m γ}]}^{1 / 2}

B

{[\frac{2 (h c + γ ϕ)}{m γ}]}^{- 1 / 2}

C

\frac{2 (h c + γ ϕ)}{m}

D

{[\frac{2 (h γ - ϕ)}{m}]}^{1 / 2}

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