Two sinusoidal waves with identical wavelengths and amplitudes travel in opposite directions alo...

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Two sinusoidal waves with identical wavelengths and amplitudes travel in opposite directions along a string with a speed of \( 15 \mathrm{~cm} / \mathrm{s} \). If the time interval between instants when the string is flat is \( 0.20 \mathrm{~s} \), what is the wavelength of the waves?
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