In a simple harmonic progressive wave, the propagation constant is defined by `K = (2pi)/(lamda)`. What is the unit and dimensional formula of K?

Options

A. degrees/cm, `[K] = [M^(1) L^(0) T^(-1)]`
B. radian/metre, `[K] = [M^(0) L^(-1) T^(0)]`
C. per metre, `[K] = [M^(0) L^(1)T^(0)]`
D. radian metre, `[K] = [m^(1) L^(1) T^(0)]`

Answer

B