Einstein's photo-electric equation states that $E_{k} = h v - W .$ In this equation, $E_{k}$ refers to:

kinetic energy of all ejected electrons

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mean kinetic energy of emitted electrons

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minimum kinetic energy of emitted electrons

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maximum kinetic energy of emitted electrons

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Solution

The correct option is C maximum kinetic energy of emitted electrons
As we know,
in photo-electric effect,
$K E = h v - h v_{0} = h v - W$
where W is work function and KE is kinetic energy of emitted electrons.
(The energy of photon absorbed is used in doing work against forces of attraction and rest is used in giving kinetic energy to electron.)

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