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The Electronics of Radio by David Rutledge

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7Acoustics

Sounds are pressure waves. When an object moves suddenly in air, the air is compressed. This compression causes a change in pressure. The pressure change results in a push on the surrounding air, which causes it to move, disturbing air that is farther away. The result is a disturbance that propagates away from the object. These pressure changes are ordinarily quite small – the changes in a normal conversation are only about a millionth of atmospheric pressure.

7.1 Equations of Sound

We can derive a formula for the speed of sound in terms of the basic properties of air. The equations turn out to be similar to the transmission-line equations, with pressure playing the role of voltage and average velocity the role of current. We start ...

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