Question

Calculate the wave number with
wavelength 4 x 10^7 nm​

Answer 1

$\huge{\mathcal{\green{\underline{Answer}}}}$

wavelength = 4 × 10^7 nm = 4 × 10^7 × 10^-9 m

[1nm = 10^-9m (note) ]

= 4 × 10^-2m

=> wavenumber = 1/wavelength

=> wavenumber = 1/4×10^-2 m

$\huge{\mathcal{\green{\underline{wavenumber\:=\:25/m}}}}$

Answer 2

Answer:

your ans is 25

I hope it helps you