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Two sound waves of wavelengths
\( \mathrm{P} \) \( \lambda_{1} \) and \( \lambda_{2}\left(\lambda_{2}\lambda_{1}\right) \) produce \( n \) beats \( / s \), the speed of

W sound is
(1) \( \frac{n \lambda_{1} \lambda_{2}}{\lambda_{2}-\lambda_{1}} \)
(2) \( n\left(\frac{1}{\lambda_{1}}-\frac{1}{\lambda_{2}}\right) \)
(3) \( n\left(\lambda_{2}-\lambda_{1}\right) \)
(4) \( n\left(\lambda_{2}+\lambda_{1}\right) \)
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