Question

Which are the most important properties of sound?
(a) amplitude
(b) frequency
(c) loudness
(d) Both a and b

Answer 1

Hint: In this question use the basic definitions of amplitude, frequency and loudness as all these are the basic and important properties of the sound. This will help approach the final solution for this problem statement.

Complete Step-by-Step solution:
There are two important properties of sound which is given below:
$\left( 1 \right)$ Amplitude – Amplitude determines the loudness of the sound (i.e. the strength of sound whether it is too high, high, low or too low).
$\left( 2 \right)$ Frequency – Frequency determines the pitch of the sound or the sound waves (i.e. the number of waves that passes from a fixed point in a second).
Humans can normally hear sounds with a frequency between 20 Hz to 20,000 Hz.
And we measure the sound (i.e. unit of sound) in decibel (db.) that determines the loudness of the sound.
So this is the required answer.
Hence option (D) is the correct answer.

Note – Sound is basically composed of sound waves and it is termed as a wave of compression and rarefaction, by which sound is propagated in an elastic medium. Sound waves are simply pressure caused by the vibration of something in a medium that transfer energy, just like water. Vacuum can’t transfer these waves and thus there are no sound waves that can travel in space.