Using Bohr's model , calculate the wavelength of the radiation emitted when an electron in a hydrogen atom makes a transition from the fourth energy level to the second energy level.

Explanation

`E_(3)` for `H = - 2.14 xx 10^(-12)` erg
`E_(2)` for `H = - 5.42 xx 10^(-12)` erg
For a jump from third to second shell
`Delta E = E_(3) - E_(2) = (hc)/(lambda)`
`:. Lambda = (hc)/(E_(3) - E_(2))`
`= (6.625 xx 10^(-27) xx 3 xx 10^(10))/( - 2.41 xx 10^(-8) cm = 6603Å`