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7. A plane sound wave in air of 120 Hz has a peak acoustic pressure of 1.8 Pa. Determine the
(i) peak particle displacement amplitude; and
(ii) peak particle acceleration amplitude.
Given:
Temperature = 23°C
Universal gas constant 8.314 J/mol K
Molar mass = 28.97 g/mol
Ambient pressure of air 101.325 x 10 Pa
Speed of sound c 331.3x1+
273.15
T
, where Tis temperature (°C).

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