Amplitude Of A Wave

Sound is a form of energy that is produced by vibrating bodies. It requires a medium for its propagation. Hence, sound cannot propagate in a vacuum as there will be no material to transfer sound waves. The back and forth motion of an object due to which sound is produced are known as sound vibration. It is also known as oscillatory motion. The regular rhythmic back and forth movement is referred to as the oscillation.

Learn more about the properties of sound by watching the video below:


Some of the quantities that are used to explain sound are period, frequency and amplitude. They are described below:

What is the Period of Sound?

A period can be said to be the time taken to do something. If an event occurs repeatedly then the event is said to be periodic. The time taken by the periodic event to repeat itself is known as the period. The time taken by the particle to complete one vibration cycle is the time period for that particle.

Period = 1/Frequency

What is the Frequency of Sound?

The number of oscillations per second is known as the frequency of oscillation. Its unit is hertz and is denoted by Hz. The frequency of a wave in general means how frequently the particles of a medium vibrate when a wave moves through the medium.

Frequency = 1/Period

Frequency of Sound

What is the Amplitude of Sound?

The amplitude of a sound wave is the measure of the height of the wave. The amplitude of a sound wave can be defined as the loudness or the amount of maximum displacement of vibrating particles of the medium from their mean position when the sound is produced. It is the distance between crest or trough and the mean position of the wave.Amplitude of sound

Loudness is directly proportional to the amplitude of the sound. If the amplitude of a sound wave is large then the loudness of sound will be more. If the amplitude is small then the sound will be feeble.

Amplitude of sound

To better understand the above explained concepts, watch the video given below.


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