Assertion : As work function of a material increases by some mechanism, it requires greater energy to excite the electrons from its surface. Reason : A plot of stopping potential ( V s ) versus freq

Question

Assertion : As work function of a material increases 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.

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Answer:

C

Solution:

As eV $= h s - W$ $V_{s} = (\frac{h}{e}) v - (\frac{W}{e})$ For $V_{s}$ versus $v$ graph, slope $= \frac{h}{e} =$ constant.

TestHub · Accepted Answer

As eV = h s − W V s ​ = ( e h ​ ) v − ( e W ​ ) For V s ​ versus v graph, slope = e h ​ = constant.

Physics - Modern Physics Question with Solution | TestHub

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