A travelling wave passes a point of observation. At this point, t… - Vidyadip

MCQ

A travelling wave passes a point of observation. At this point, the time interval between successive crests is 0.2 seconds and

A
The wavelength is $5 \mathrm{~m}$
✓
The frequency is $5 \mathrm{~Hz}$
C
The velocity of propagation is $5 \mathrm{~m} / \mathrm{s}$
D
The wavelength is $0.2 \mathrm{~m}$

✓

Answer

Correct option: B.

The frequency is $5 \mathrm{~Hz}$

(b) Phase difference between two successive crest is $2 \pi$. Also, phase difference $(\Delta \phi)=\frac{2 \pi}{T}$ time interval $(\Delta t)$$\Rightarrow 2 \pi=\frac{2 \pi}{T} \times 0.2 \Rightarrow \frac{1}{T}=5 \mathrm{sec}^{-1} \Rightarrow n=5 \mathrm{~Hz}$

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