What are tge two kinds of sound waves
The two kind of sound waves are
On the basis of energy propagation
Audible or sound waves : Range 20 Hz to 20 KHz. These are generated by vibrating bodies such as vocal cords, stretched strings or membrane.
(i) Infrasonic waves : Frequency lie below 20 Hz and wavelengths are greater than 16.6 cm. Example : waves produced during earth quake, ocean waves etc.
(ii) Ultrasonic waves : Frequency greater than 20 KHz. Human ear cannot detect these waves, certain creatures such as mosquito, dog and bat show response to these. As velocity of sound in air is 332 m/sec so the wavelength λ< 1.66 cm. These waves are used for navigation under water (SONAR). They are used in ultrasonography (in photography or scanning soft tissue of body). Their used to repel mosquitoes or attract fishes.
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