Physics of Sound & Music NEED HELP

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To determine the amplitude of the pressure wave, the initial atmospheric pressure of 0.850 atm and the reduced pressure of 0.841 atm must be analyzed. The difference in pressure, resulting from the rarefactions of the sound wave, is critical for calculating amplitude. Participants are encouraged to show their thought process and initial attempts at solving the problem to receive more targeted assistance. Understanding the concept of rarefaction is also essential for a clearer grasp of the question. Engaging with the community and following forum guidelines will enhance the learning experience.
Brandi10
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Does anyone know how to solve this question?

The atmospheric pressure is 0.850 atm. The rarefactions of a particular sound wave then reduce the pressure to 0.841 atm, what is the amplitude of the pressure wave expressed in metric units N/m2(squared)?
 
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Welcome to PF forums! If you've looked around, I believe you will find some very useful and interesting discussions as well as helpful people. Before we can give you some guidance, you will need to show us some work. What is your thought process so far, and attempt at a solution? (please reread the sticky https://www.physicsforums.com/showthread.php?t=94379 at the top of the forum page). You might start by defining some terms. What does rarefaction mean in your example?
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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