What is the wavelength of 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?



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Q.13:- What is the wavelength of 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?

 

 

Answer:-
ṽ = R(1/n12 – 1/n22) = 109677(1/22 – 1/42) cm-1 = 20564.4 cm-1 
λ = 1/ν = 1/20564.4 = 486×10-7 cm =  486×10-9 m = 486 nm
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