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Consumer Electronics by S. P. Bali

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ABSORPTION OF SOUND

When a sound wave strikes a surface, part of its energy is absorbed by friction, part of its energy is transmitted and the remaining part of its energy is reflected. As reverberation directly depends on the loss of energy of sound waves due to friction, it is of great importance. This property of a surface by which sound energy is converted to some other form of energy is known as absorption and the absorption coefficient of a surface indicates the degree to which this surface affects the absorption of sound. It is thus the ratio of the energy obsorbed by the area to the energy striking the area.

The value of the coefficient of absorption will depend on the frequency of the sound. Table 6.3 gives the value of coefficient ...

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