Assertion :Photoelectric effect is easily pronounced by caesium metal. Reason: Photoelectric effect is easily pronounced for the metals with high ionization energy.

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 C Assertion is correct but Reason is incorrect
Relation between kinetic energy and frequency is $E = ϕ - h ν$ .
here $h$ = planck's constant h = $6.62 \times 10^{- 34}$
$ϕ =$ work function of metal
Metals have low work function give Photoelectric effect instantly.
Work function is equals to first ionization energy.
Hence Low ionization energy will give easily Photoelectric effect.

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