Question

calculate the frequency and wavenumbers of blue light of wavelength 4800A​

Answer 1

Answer : 2.08×10^-4 cm^-1

Solution :

As we know that :Frequency (ν) = c/λ

λ = 4800A = 4.8 x 10^-7 m

Now,

Frequency = 3 x 10^8/ 4.80 x 10^-7

=> Frequency = 6.25 x 10^14 Hz

Again, as we know that :

wave number = 1/λ

After putting the value of λ within the given formula :

wave number = 1/4.8 x 10-7 m-1

=> 0.208333 x 10^-7 m-1

=> 2.0833 x 10^-4 cm-1