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Suppose that two sinusoidal waves with the same amplitude and frequency, moving in the positive $\hat{x}$ direction, overlap in a certain region of space and time. The wavelength of both waves is $\lambda = 24 \text{ cm}$. Because these two waves inhabit the same region of space and time, they will interfere. Figure 1 depicts the wave resulting from the interference of these two waves at time $t = 0$, as a function of position $x$.

Figure 1. Timothy Black. Created for Albert.io. Copyright 2017. All rights reserved.

What is the phase difference $\phi$ between the two waves?

A

$\phi = 11 \text{ rad}$

B

$\phi = \pi /6 \text{ rad}$

C

$\phi = 12 \text{ rad}$

D

$\phi = \pi /11 \text{ rad}$

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