Question

What are the three types of sound waves?

Answer 1

Sound:

1. Sound is a form of energy produced by vibrations.
2. When an item vibrates, the surrounding air molecules move.
3. These molecules collide with molecules nearby, forcing them to vibrate as well.
4. This causes them to collide with additional surrounding air molecules.
5. This "chain reaction" movement, known as sound waves, continues indefinitely until the molecules run out of energy.

Types of sound:

Sonic Waves:

1. The human ear is susceptible to sound waves with frequencies ranging from $20\mathrm{Hz}$ to $20\mathrm{kHz}$
2. This range is referred to as the audible range, and these waves are referred to as audible waves.
3. Example: Vibrating sitar, guitar, organ pipes, flutes, shehnai, and other instruments generate waves.

Ultrasonic waves:

1. An ultrasonic wave is a longitudinal wave with a frequency greater than the top limit of hearing range, i.e. $20\mathrm{kHz}$.
2. It is produced by extremely modest sources.
3. Example: Quartz crystal

Infrasonic waves:

1. An infrasonic wave is a longitudinal elastic wave with a frequency less than the hearing range, i.e. $20\mathrm{Hz}$.
2. It is often produced by a huge source.
3. Elephants use Infrasonic sounds to interact with herds hundreds of km away.
4. Example: Earthquake.