A travelling wave passes a point of observation. At this point, the time interval between successive crests is $0.2$ seconds and
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(b) Phase difference between two successive crest is $2 \pi$.
Also, phase difference $(\Delta \phi )$= $\frac{{2\pi }}{T}$ time interval $(\Delta t)$
==> $2\pi = \frac{{2\pi }}{T} \times 0.2 \Rightarrow \frac{1}{T} = 5{\sec ^{ - 1}} \Rightarrow n = 5\,Hz$
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