Assertion :As work function of a material increase by some mechanism, it requires greater energy to excite the electrons from its surface. Reason: A plot of stopping potential $(V_{s})$ versus frequency $(v)$ for different metals, has greater slope for metals with greater work functions.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
As $e V_{s} = h v - W$
$V_{s} = (\frac{h}{e}) v - (\frac{W}{e})$
For $V_{s}$ versus $v$ graph, $s l o p e = \frac{h}{e} = c o n s t a n t$ .

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