The rope shown at an instant is carrying a wave travelling towards ...

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The rope shown at an instant is carrying a wave travelling towards right, created by a source vibrating at a frequency
\( \mathrm{P} \) \( n \). Consider the following statements
I. The speed of the wave is \( 4 n \times a b \)
II. The medium at \( a \) will be in the same phase as \( d \) after \( \frac{4}{3 n} s \)
III. The phase difference between \( b \) and \( e \) is \( \frac{3 \pi}{2} \)
Which of these statements are correct
[AMU 2001]
(a) I, II and III
(b) II only
(c) I and III
(d) III only
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