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Q.

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

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a

25 m

b

15 m

c

20 m

d

10 m

answer is D.

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Detailed Solution

T2=0.5sec⇒T=1sec∴f=1T=1Hz

∴λ=Vf=101m=10m

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