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 |