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Answers
Sound is defined as the mechanical energy which is produced due to the vibrations of different objects. When the particles move back and forth from their central position there is a production of vibrations like in case of a guitar. When the strings of a guitar are struck, there is a production of sound. When these sound waves travel from one medium to another, it is known as the propagation of sound. For these vibrations to travel, a medium is required.
The medium could be solid, liquid, or gas. It is important to understand that sound waves cannot travel in a vacuum as there are no air particles to propagate the sound waves. Following are the characteristics of sound waves:
Amplitude
Wavelength
Frequency
Time period
Velocity
The propagation of waves is based on the direction of propagation and there are two categories of waves:
Longitudinal waves: When the waves have particles that vibrate along the direction of propagation of the waves. Sound waves are longitudinal waves.
Transverse waves: When the waves have particles that vibrate perpendicular to the direction of propagation of the waves. Waves produced in a stretched string is an example of transverse waves.
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