Two sinusoidal waves with same wavelengths and \( \mathrm{P} \) amp...

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Two sinusoidal waves with same wavelengths and
\( \mathrm{P} \) amplitudes travel in opposite directions along a string with a speed \( 10 \mathrm{~ms}^{-1} \). If the minimum time interval between two
W instants when the string is flat is \( 0.5 \mathrm{~s} \), the wavelength of the waves is
[Roorkee 2000]
(a) \( 25 \mathrm{~m} \)
(b) \( 20 m \)
(c) \( 15 m \)
(d) \( 10 m \)
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