Q.
Two sinusoidal waves with same wavelengths and amplitudes travel in opposite directions along a string with a speed l0 m/s. 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
15m
d
lOm
answer is D.
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Detailed Solution
Minimum time interval between two instants when the string is flat = T2 = 0.5 sec ⇒T = 1 secHence λ = v×T = 10×1 = 10 m
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