Question

Match the following physical quantities with their respective SI units.

• A. $\text{Hz}$
• B. $\text{m}$
• C. $\text{s}$
• D. $\text{dB}$

Answer 1

Wavelength is the distance between two consecutive crest and trough. Its SI unit is metre ($m$),
Frequency is the number of oscillations/vibrations per second. Its SI unit is hertz ($Hz$).
Time taken to complete one oscillation is time period. Its SI unit is second ($s$).
Loudness of a sound is determined by its amplitude. It is expressed in decibel ($dB$).