Graph between maximum kinetic energy of electron and frequency of incident photon in photoelectric effect is shown. The slope of the curve is

Charge of an electron

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Work function of metal

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Planck’s constant

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Ratio of Planck’s constant and charge of electron

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Solution

The correct option is C Planck’s constant
For incident photon of frequency $ν$ , the K.E of the ejected electron, $E_{k}$ is given by
$h ν = ϕ + E_{k}$
where $ϕ$ is a constant and a property of the material.

$∴ E_{k} = h ν - ϕ$
This is of the form $y = m x + c$ (eqn. of a straight line).

Slope of the line $= h =$ Planck's constant

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

Q. A graph regarding photoelectric effect is shown between the maximum kinetic energy of electrons and the frequency of the incident light. On the basis of the data as shown in the graph, calculate the work function.

According to Einstein photoelectric effect equation, the graph between the kinetic energy of photoelectron ejected and the frequency ( $ν$ ) of incidented radiations is:

In a photoelectric effect experiment, the potential difference

V

that must be maintained between the illuminated surface and the collector so as just to prevent any electron from reaching the collector is determined for different frequencies

f

of the incident radiation.
The graph obtained is as shown. The maximum kinetic energy of the electrons emitted at frequency

f_{1}

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