For a person with normal hearing

PHYSICS · Subjective · A Level · Physics · Waves · Waves

Problem

For a person with normal hearing, the faintest sound that can be heard at a frequency of

400\,\text{Hz}

has a pressure amplitude of about

6.0\times10^{-5}\,\text{Pa}

. Calculate the corresponding intensity and sound intensity level at

20^\circ\text{C}

. Assume

v=330\,\text{m s}^{-1}

and

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