Myself Sarthak Kenjale  Class - 8f Topic - Audible and Inaudible sounds

Myself Sarthak Kenjale Class - 8f Topic - Audible and Inaudible sounds.

Audible and Inaudible Sounds. We know that we need a vibrating body for the production of sound. Can we hear the sound of all vibrating bodies? The fact is that sounds of frequencies less than about 20 vibrations per second (20 Hz) cannot be detected by the human ear. Such sounds are called inaudible. On the higher side, sounds of frequencies higher than about 20,000 vibrations per second (20 kHz) are also not audible to the human ear. Thus, for human ear, the range of audible frequencies is roughly from 20 to 20,000 Hz..

Chart Description automatically generated. Whenever an object virbrates , sound is produced. For example , when a simple pendulum vibrates sound is produced. But the sound produced by a vibrating simple pendulum is not heard by us. This is because the frequency of vibration of a simple pendulum is very low. It may be 2 or 3 heartz only.

Background pattern Description automatically generated.

Some animals can hear sounds of frequencies higher than 20,000 Hz. Dogs have this ability. The police use high frequency whistles which dogs can hear but humans cannot. The ultrasound equipment, familiar to us for investigating and tracking many medical problems, works at frequencies higher than 20,000 Hz..

Differentiate between audible and inaudible sounds..

Answer- (20-20,000 Hz). Human can hear sound in the range of (a) 200-2000 Hz (b) 20-20,000 Hz (c) 2-20000 Hz (d) 2000-200000 Hz.

Answer Yes, animals can hear sounds of frequencies higher than 20,000 Hz For Example - dogs.

Inaudible sounds are those sounds who have frequency not audible for human ear. Their frequency is above 20KH.

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