Problem

For a person with normal hearing, the faintest sound that can be heard at a frequency of 400 Hz has a pressure amplitude of about

6.0 \times 10^{-5} \text{ Pa}

. Calculate the corresponding intensity and sound intensity level at

20^\circ \text{C}

. (Assume

v = 330 \text{ m/s}

and

\rho_{\text{air}} = 1.29 \text{ kg/m}^3