The rope shown at an instant is carrying a wave travelling towards right, created by a source vibrating at a frequency n. Consider the following statements
I. The speed of the wave is $4 n \times ab$
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 $\frac{3 π}{2}$
Which of these statements are correct

Question

The rope shown at an instant is carrying a wave travelling towards right, created by a source vibrating at a frequency n. Consider the following statements

I. The speed of the wave is $4 n \times ab$
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 $\frac{3 π}{2}$
Which of these statements are correct

Infinity Learn · Accepted Answer

Speed $$=$$ nλ$$=n(4ab)=4n$$×ab     As $$ab=$$λ$$4Path$$ difference between b and e is $$3$$λ$$4So$$ the phase difference $$=$$ $$2$$πλ. Path difference                                       $$=$$  $$2$$πλ$$.3$$λ$$4=3$$$$π$$$$2$$

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