Question

the wavelength of electromagnetic radiation is 400nm this wave number will be equal​

Answer 1

Answer:

Wavenumber of a wave is defined as

ν

~

=

λ

1

, where λ is the wavelength.

Given that wavelength of the photon is λ=400 nm=400×10

−9

m

Thus, wave number is

ν

~

=(400)

−1

nm

−1

=0.0025 nm

−1