Which has a more direct influence on the loudness of a sound wave: the displacement amplitude or the pressure amplitude? Explain your reasoning.
1 Answer
Pressure amplitude has a direct influence on the loudness of sound waves. This is because the value of pressure amplitude has a greater value than the displacement amplitude and the intensity depends upon the pressure amplitude as
\(I=\frac{\left(\triangle P_m\right)^2}{2\rho v}\)
This shows that the intensity is influenced by pressure amplitude.
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