1.

The energy (in W) required to excite an electron from n = 2 to n = 4 state in hydrogen atom

Answer»

`+2.55`
`-3.4`
`-0.85`
`+4.25`

SOLUTION :We know that,
`E_(n)=(13.6)/(n^(2))`
According to question, the required ENERGY is
`E=E_(2)-E_(4)`
`=(13.6)/((2)^(2))-(13.6)/(4^(2))=(13.6)/(4)-(13.6)/(16)`
`=((13.6xx4)-13.6)/(16)`
`= (40.8)/(16)=+2.55`


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