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There are many uses of sound: Sound is used to communicate eith each other. In SONAR(Sound Navigation and Ranging)sound is used to determine the position of submarines in sea or to find the depth of sea. Sound finds many applications in entertainment electronics, radio, cassette, etc.
Musical Instruments People have been using sound to make music for thousands of years. They have invented many different kinds of musical instruments for this purpose. Despite their diversity, however, musical instruments share certain similarities. - All musical instruments create sound by causing matter to vibrate. The vibrations start sound waves moving through the air. - Most musical instruments use resonance to amplify the sound waves and make the sounds louder. Resonance occurs when an object vibrates in response to sound waves of a certain frequency. In a musical instrument such as a guitar, the whole instrument and the air inside it may vibrate when a single string is plucked. This causes constructive interference with the sound waves, which increases their amplitude. - Most musical instruments have a way of changing the frequency of the sound waves they produce. This changes the pitch of the sounds.
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