Elctrons make transition from n =2 to n ...

Elctrons make transition from n =2 to n =1 in a sample of excited hydrogen atom. Emitted photons strike on a metal of work function `(phi) = 4.2 eV.` What is the valueof maximum kinetic energy of ejected electron in process ?

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The correct Answer is:

`E _("in") = 10.2 eV`
`phi = 4.2 eV`
`K E _("max") = 10.2 - 4.2 = 6 eV`
The maximum kinetic energy in this case will be "6 eV".

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