The above shows the wave front \(A'B'\) of a plane wave generated by the point wave sources on the wave front \(AB.\) The spherical waves, which are generated at the wave front \(AB,\) propagate with a distance of \(r\) while the medium vibrates once. Which of the following statements is correct?

a) All the points in the wave front \(AB\) have the same phase.

b) The frequency of a point in the wave front \(AB\) is greater than that in the wave front \(A'B'.\)

c) The wavelength of this plane wave is \(r.\)

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