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The wavelength of this wave is 0.232m.

Suppose people in the fourth row of seats hear this note with level 79.8 dB. Find the displacement amplitude of the sound.

A=Δp

_{o}/ωρc

f=v/λ

ω=2∏f

By substituting all the known values into the first equation I'm left with an unknown variable - Δp

_{o}.

I've looked everywhere to try and discover an equation for the pressure amplitude but to no avail. I'm assuming it has something to do with the loudness I've been given but I've been plugging away for an hour or so now and I've come nowhere near a correct answer.