Question

Wave number is defined as the number of wavelengths per unit length.

• A. True
• B. False

Answer 1

The correct option is A

True

Wave number isdefined as the number of wavelengths per unit length. It is equal to the inverse of wavelength. It is denoted by $\overline{v}$. Its unit is $m^{-1}$.
$\overline{v}=\frac{1}{\lambda }=\frac{c}{v}$