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Question

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

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
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=ϕhν.
here h = planck's constant h = 6.62×1034
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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