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Uses of Sound

1. We use sound mainly to communicate with each other.

2. In SONAR (Sound Navigation and Ranging) sound is used to determine the position of a submarine or the depth of the sea at any place. The principle used is that of reflection of sound.


3. Sound finds many applications in entertainment electronics (TV, radio, cassette and compact disc (CD) players, public address system, etc.)

4. Ultrasonics are used in the fields of engineering, industry, diagnostic, medicine, surgery, etc.

5. Infrasonics are used in drilling deep oil wells.

Range of Hearing in Humans

If the frequency of the sound wave is less than 20 Hz or greater than 20,000Hz, it cannot be heard by human beings. The human ear can hear sounds of frequencies between 20 Hz and 20,000 Hz. This is known as the frequency range of hearing or audible range in humans. Frequencies below 20 Hz are called infrasonic. e.g. earthquakes, volcanic eruptions, sounds made by some animals like whales etc. 

Frequencies over 20,000 Hz are called ultrasonic or ultrasound. Dogs can hear ultrasonic frequencies up to 50,000Hz. That is why they are used for detective purposes.

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