Graph is plotted between maximum kinetic energy of electron with frequency of incident photon in Photo electric effect. The slope of curve will be :

Charge of electron

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Work function of metal

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Planck's constant

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Ratio of planck constant and charge of electron

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Solution

The correct option is C Planck's constant
From the $E_{k} - V$ graph,
The slope of the curve is Planck's constant.
From the Einstein photoelectric equation,
$E_{k} = h V - ϕ$ . . . . .(1)
where, $ϕ =$ work function.
$V =$ frequency
From the equation (1)
$m = h$ (equation of straight line, $Y = m x + c$ )
The slope of the curve is $h$ .
The correct option is C.

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