Part A

$($Figure $1)$ shows the wave fronts of a circular wave.

What is the phase difference between points $1$ and $2?$

Express your answer in radians in terms of constant $\backslash (\backslash$pi $\backslash ).$

$\backslash (\backslash$Delta $\backslash$phi$\_\{12\}=\backslash )$ 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 $\backslash (\backslash$pi $\backslash ).$

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Part C

What is the phase difference between points $5$ and $6?$

Express your answer in radians in terms of constant $\backslash (\backslash$pi $\backslash ).$

Figure

$\backslash (\backslash$Delta $\backslash$phi$\_\{56\}=\backslash )$

rad