# Pressure wave equation

1 vote
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In the first equation why amplitude is $2P_0$ .
And I think the equation is wrong .

the equation should be

asked May 14, 2017
It does not make sense to me why $2P_0$ is used. If you do not like it replace $2P_0$ by $P_0$. It should not affect the result.

What do you think is wrong about the equation and why? Do you think the solution is wrong?