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  4. The graph between frequency of incident radiations and stopping potential for a given photosensitive material is as follows. <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-f0mjctxys3bqudj6.jpg /> What information can be obtained from the value of the intercept on the potential axis?

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Q. The graph between frequency of incident radiations and stopping potential for a given photosensitive material is as follows.
Question
What information can be obtained from the value of the intercept on the potential axis?

NTA AbhyasNTA Abhyas 2022

Solution:

Graph between frequency of incident radiation and stopping potential for a given photosensitive surface is shown below:
Solution
Intercept on the potential axis $= - \frac{W_{0}}{e}$
$∴$ Work function, $W_{0} = e \times $ Magnitude of intercept on the potential axis.