Question

what is sound and how do we produce and hear sound​

Answer 1

Answer:

In physics, sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid.

In human physiology and psychology, sound is the reception of such waves and their perception by the brain.[1] Only acoustic waves that have frequencies lying between about 20 Hz and 20 kHz, the audio frequency range, elicit an auditory percept in humans. In air at atmospheric pressure, these represent sound waves with wavelengths of 17 meters (56 ft) to 1.7 centimetres (0.67 in). Sound waves above 20 kHz are known as ultrasound and are not audible to humans. Sound waves below 20 Hz are known as infra sound. Different animal species have varying hearing ranges.

HOW TO  HEAR SOUND :-

The object produces waves by vibrating. When an object vibrates, it pushes against the surrounding air. The vibrations cause the air to expand (called rarefaction) and compress. This causes areas of high and low pressure as the sound moves towards your ears in the form of waves.

HOW TO PRODUCE SOUND :-

The vocal folds produce sound when they come together and then vibrate as air passes through them during exhalation of air from the lungs. This vibration produces the sound wave for your voice. In order for the sound to be clear and not raspy or hoarse, the vocal folds must vibrate together symmetrically and regularly.

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