The answer from the book is “ just begining to decrease”. The answer gives a hin

Question

The answer from the book is “ just begining to decrease”. The answer gives a hint to mentally move the curves of Fig 17-6 rightward past the point c=42 cm. At x=42, isn’t the element moving to the left towards -10 instead of the right? Seems like at x=25 it is at the equilibrium moving right toward +10 and the pressure is at -30 and can only increase from there. 7 t i Checkpoint 1 When the oscillating air element in Fig. 17-4b is moving rightward through the point of zero displacement, is the pressure in the element at its equilibrium value, just be- ginning to increase, or just beginning to decrease?

Explanation / Answer

Remember, In question they have told the point of zero displacement. You have to look at the point which lies on the x axis and where the oscillating wave intersects the x - axis. although 25 cm is an equilibrium point but not for the wave as it doen't passes through that point as given in the figure. ( Look at pressure vs x curve not the displacement vs x curve)

From point of equilibirum , the pressure has begun to decrease and move towards negative values

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