Part A
(Figure 1) shows the wave fronts of a circular wave.
Figure
What is the phase difference between points 1 and 2?
Express your answer in radians in terms of constant $\pi$.
$\Delta \phi_{12} =$ rad
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Part B
What is the phase difference between points 3 and 4?
Express your answer in radians in terms of constant $\pi$.
$\Delta \phi_{34} =$ rad
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