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Sound Waves

The energy to which the human ears are sensitive is known as sound. In general, all types of waves are produced in an elastic material medium. Irrespective of whether heard or not these are known as sound.
According to their frequencies, waves are divided into three categories:
Audible or sound waves Frequency lie 20 Hz to 20 kHz. These are generated by vibrating bodies such as vocal cords, stretched strings, or membrane.
Infrasonic waves Frequency lie below 20 Hz.
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 the velocity of sound in air is 332 m/s so the wavelength of ultrasonics (λ) < 1.66 cm and for infrasonics (λ) > 16.6 m.

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