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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?

347590_9b7ea019d14341399527c7c36da8040b.png


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

The correct option is B (i) and (iii) only
Statement (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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