What is the wavelength of the light emitted when the electron in a hydrogen atom undergoes transition from an energy level with n=4 to an energy level with n=2 ? What is the colour corresponding to this wavelength ? (Rydberg constant =109, 677 cm^(-1))

What is the wavelength of the light emitted when the electron in a hyd

1.	What is the wavelength of the light emitted when the electron in a hydrogen atom undergoes transition from an energy level with n=4 to an energy level with n=2 ? What is the colour corresponding to this wavelength ? (Rydberg constant =109, 677 cm^(-1))
Answer» Solution :`bar(v)=R(1/n_(1)^(2)-1/n_(2)^(2))=109677 (1/2^(2)-1/4^(2)) CM^(-1) =20564.4 cm^(-1)` `lambda =1/v=1/(20564.4 cm^(-1))=486xx10^(-7) cm=486xx10^(-9) m=486 nm` The colour CORRESPONDING to this wavelength is blue.