Light corresponding in the transition n ...

Light corresponding in the transition `n = 4 to n = 2 `in hydrogen atoms falls an cesium metal (work function `= 1.9eV)` Find the maximum kinetic energy of the photo electrons emitted

A

`2.55 eV`

B

`1.9 eV`

C

`1.65 eV`

D

`0.65 eV`

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A

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