Question

Match the following physical quantities with their respective S.I. units.

• A. metre
• B. hertz
• C. second
• D. metre per second

Answer 1

Wavelength is the distance between two consecutive crests and troughs. Its S.I. unit is metre ($\text{m}$).
Frequency is the number of oscillations or vibrations per second. Its S.I. unit is hertz ($\text{Hz}$).
The time taken to complete one oscillation is time period. Its S.I. unit is second ($\text{s}$).
Wave speed is the speed at which the wave propagates through the medium. Its S.I. unit is metre per second (${\text{m s}}^{-1}$).