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Q.

Two sinusoidal waves with same wavelengths and amplitudes travel in opposite directions along a string with a speed 10 ms–1. If the minimum time interval between two instants when the string is flat is 0.5 s, the wavelength of the waves is

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a

25 m

b

20 m

c

15 m

d

10 m

answer is D.

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Detailed Solution

Minimum time interval between two instants when the string is flat = T2=0.5sec⇒T=1secHence λ=v×T=10×1=10 m.
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