Question

The S.I. unit of the frequency of a wave is

• A. metre per second
• B. per second
• C. Hz
• D. (b) and (c) above.

Answer 1

The correct option is D (b) and (c) above.

The frequency of a wave is defined as the number of times a particle of the wave oscillates about its mean position in one second. So, its unit is per second (${\text{s}}^{-1}$). However, another popular S.I. unit of frequency is hertz ($\text{Hz}$), named after the scientist Heinrich Hertz.