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roam
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Homework Statement
A traveling sound wave causes a variation in air pressure according to the equation:
∆P = 20.0 sin(15.5x − 5.32 × 103t )
where x is in metres, t in seconds and pressure is in pascals.
What is the amplitude of the displacement of the air particles caused by this pressure wave (i.e. the displacement amplitude)?
Take ρair=1.21 kgm–3.
Homework Equations
Pressure amplitude is related to displacement amplitude by
[tex]\Delta P_{max}= \rho v \omega s_{max}[/tex]
The Attempt at a Solution
I know that the angular frequency ω of the pressure wave is 5320.0 rads–1, and the velocity v of the pressure wave is 343.0 ms–1. But I can't use the formula above because I can't determine the value of [tex]\Delta P_{max}[/tex].
How can I find [tex]\Delta P_{max}[/tex] from
∆P = 20.0 sin(15.5x − 5.32 × 103t )
when I don't know the values of "x" and "t"? What values do I need to substitute there?