Question

# The rope shown at an instant is carrying a wave travelIing towards right created source vibrating at a frequency n consider the following statement:(i) The speed of the wave is $$4n \times ab$$(ii) The medium at a will be in the same phase as d after $$\displaystyle \frac{4}{3n}$$ sec(iii) the phase difference between b and e is $$\displaystyle \dfrac{3 \pi}{2}$$Which of these statement(s) is/are correct?

A
(iii) only
B
(i) and (iii) only
C
(ii) only
D
(ii), (i), (iii)

Solution

## The correct option is B (i) and (iii) onlyStatement (iii) is only correct as the phase differences between points band c, c and d and d and e are $$\displaystyle \frac{\pi}{2}$$ each$$\therefore$$ the phase difference between b and e $$\displaystyle \frac{\pi}{2} + \frac{\pi}{2} + \frac{\pi}{2}= \frac{3 \pi}{2}$$Physics

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