The electron energy in hydrogen atom is given by `E_(n) =(-21.7xx10^(12))/n^(2)ergs`. Calculate the energy requried to remove an `e^(-)` completely from n=2 orbit . What is the largest wavelenght in cm of light that can be used to cause this transition .

Explanation

For complete removal from n=2 `DeltaE_(n)`=`+2.1xx10^(-12)[(1)/2^(2)-(1)/oo^(2)]`
=`5.425xx10^(-12)`erg
`(hc)/(lambda)`=`DeltaE_(n) " " rArr lambda=(hc)/(DeltaE_(n) )`=`3.7xx10^(-5)`cm