1.

If energy of electron in first orbit of H-atom is - y then what will be its energy in fourth excited orbit ?

Answer»

`-(y)/(25)`
`-(y)/(16)`
`-(y)/(5)`
`-(y)/(4)`

Solution :`E_(n)PROP(1)/(n^(2))`
`:.(E_(5))/(E_(1))=(1)/(25)` [ `:.` For fourth excited STATE n=5]
`:.E_(5)=(1)/(25).(-y)=-(y)/(25)[:.E_(1)=-y]`


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