Yellow light emitted from a sodium lamp has a wavelength (λ) of 580 nm. Calculate the frequency (ν) and wave number (ṽ) of the yellow light.





Q.5:- Yellow light emitted from a sodium lamp has a wavelength (λ) of 580 nm. Calculate the frequency (ν) and wave number (ṽ) of the yellow light.

 

Answer:-
λ = 580 nm = 580×10-9 m
frequency (ν) = c/λ = 3.0×10ms-1/580×10-9 m = 5.17×1014 s-1

wave number (ṽ) = 1/λ = 1/580×10-9 m = 1.72×10m-1