Two stationary sources \( \mathrm{A} \) and \( \mathrm{B} \) are sounding notes of frequency \( ...

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Two stationary sources \( \mathrm{A} \) and \( \mathrm{B} \) are sounding notes of frequency \( 680 \mathrm{~Hz} \). An observer moves from A to \( \mathrm{B} \) with a constant velocity \( \mathrm{u} \). If the speed of sound is \( 340 \mathrm{~ms}^{-1} \), what must be the value of \( \mathrm{u} \) so that he hears 10 beats per second?
\( \mathrm{P} \)
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