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FACTS ABOUT SOUND

The speed of sound is 343 m/s

The audible range of sound in human 20 Hz to 20,000

beings is Hz
The level of sound prolonged exposure 85 dB

beyond which may cause permanent
hearing loss

A woman’s voice is shriller than a man’s Pitch
voice because of higher

The animals which produce sounds of Dolphins and
high pitch and frequency to communicate elephants

and locate each other
The loudness of sound is measured in Decibels

Stringed instruments have boxes attached Loudness of the

to increase the sound produced
The minimum distance which is required 17 metres

to hear an echo

The system of sound reflection used to SONAR (Sound
find the depth of oceans navigation
ranging)

The phenomenon which makes the sound Doppler effect
of an approaching train shriller

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