“The Knowledge Library”

Knowledge for All, without Barriers…

An Initiative by: Kausik Chakraborty.
20/03/2023 7:23 PM

“The Knowledge Library”

Knowledge for All, without Barriers……….
An Initiative by: Kausik Chakraborty.

The Knowledge Library

Facts: Sound

Facts to Remember
The speed of sound is 343 m/s
The audible range of sound in human beings is 20 Hz to 20,000 Hz
The level of sound prolonged exposure beyond which may cause permanent hearing loss 85 dB
A woman’s voice is shriller than a man’s voice because of higher Pitch
The animals which produce sounds of high pitch and frequency to communicate and locate each other Dolphins and elephants
The loudness of sound is measured in Decibels
Stringed instruments have boxes attached to increase the Loudness of the sound produced
The minimum distance which is required to hear an echo 17 metres
The system of sound reflection used to find the depth of oceans SONAR (Sound navigation ranging)
The phenomenon which makes the sound of an approaching train shriller Doppler effect
Sounds cannot travel in vacuum
Sounds travel faster in metals than in air
Sonic boom occurs when a super sonic aircraft crosses the sound barrier

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