The figure shows four progressive waves \( A, B, C \& D \). It can ...

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The figure shows four progressive waves \( A, B, C \& D \). It can be concluded from the figure that with respect to wave \( A \) :
Figure 6.97
(A) The wave \( C \) is ahead by a phase angle of \( \pi / 2 \& \) the wave \( B \) lags behind by a phase angle \( \pi / 2 \)
(B) The wave \( C \) lags behind by a phase angle of \( \pi / 2 \& \) the wave \( B \) is ahead by a phase angle of \( \pi / 2 \)
(C) The wave \( C \) is ahead by a phase angle of \( \pi \& \) the wave \( B \) lags behind by the phase angle of \( \pi \)
(D) The wave \( C \) lags behind by a phase angle of \( \pi \& \) the wave \( B \) is ahead by a phase angle of \( \pi \)
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