Assertion :Cesium is useful as electrodes in photoelectric cells. Reason: Light energy absorbed by cesium is sufficient to make an atom of cesium to lose an electron.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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.
Cesium has very low Work function so ,it's useful in photoelectric cell
Work function of Cesium is 1.95 eV, That is in the range of energy of visible ray(1.63ev to 3.65eV).

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