| 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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“The Knowledge Library”
Knowledge for All, without Barriers…
An Initiative by: Kausik Chakraborty.
“The Knowledge Library”
Knowledge for All, without Barriers……….