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Photoelectric Effect

Assertion :Ki...

Question

Assertion :Kinetic energy of photoelectrons increases with increase in the frequency of incident radiation. Reason: The number of photoelectrons ejected increases with increase in intensity of incident radiation.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Relation between kinetic energy and frequency is $K . E + ϕ = h ν$ .
here $h$ = planck's constant h = $6.62 \times 10^{- 34}$ , $ϕ = c o n s t a n t$ (Work function)
so, as we increases frequency of photon kinetic energy will increase.
numbers of ejected photo electrons depend on incident numbers of photons as we increases intensity numbers of photons per unit area will increase.

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