Question

What is the wave number for light with a wavelength of 4000 Aº?​

Answer 1

Answer:

Explanation: wave no = 1/ wavelength so

Wave no = 1/(400*10-10m)2.5*10^9

Answer 2

Answer:

$we \: know.....wave \: number = \frac{1}{wavelength} \\ \\ wave \: number = \frac{1}{4000 \times {10}^{ - 10} } \\ \\ = \frac{1}{4 \times {10}^{ - 7} } \\ \\ 0.25 \times {10}^{7} \\ \\ = 2.5 \times {10}^{6} \\ \\ so \: wave \: number \: is \: 2.5 \times {10}^{6}$

hope it helps.........✌✌