Question

If the frequency of a wave is 1.5 x 109 s-1, then its wave number will be?

5x 102 m-1
5 cm-1
5 m-1
5 x 10-3 m-1​

Answer 1

Explanation:

f = 1.5 x 10⁹

we know that,

c/v = 3 x 10⁸/1.5 x 10⁹

= 2 x 10^-1

(iii) The wave number of light wave is

ν= 1/λ

= 1 / 2 x 10^-1

=10 /2

= 5 m ^-1. ans