Assertion :Photo sensitivity of a metal is high if its work function is small. Reason: Work function $= h ν_{0}$ where $ν_{0}$ is the threshold frequency.

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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Assertion is incorrect but reason is correct

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Solution

The correct option is B Both assertion and reason are correct but reason is not the correct explanation for assertion
The photo sensitivity of a metal is high when its work function is small. Work function of a metal depends on the nature of the metal, different metals have different work functions and corresponding different threshold frequencies.

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Reason : Work function $h f_{0}$ where $f_{0}$ is the threshold frequency.

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Assertion

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Assertion: All the points (1, 0), (-1, 0), (2, 0) and (5, 0) lie on the x – axis.
Reason: Equation of the x-axis is y = 0

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