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Two sound waves of wavelength ${\lambda _1}$ and ${\lambda _2}$ $\left( {{\lambda _2} > {\lambda _1}} \right)$ produce $n\, beats/s$, the speed of sound is
  • A$\frac{{n{\lambda _1}{\lambda _2}}}{{{\lambda _2} - {\lambda _1}}}$
  • B$n\,\left( {\frac{1}{{{\lambda _1}}} - \frac{1}{{{\lambda _2}}}} \right)$
  • C${n\,\left( {{\lambda _2} - {\lambda _1}} \right)}$
  • D${n\,\left( {{\lambda _2} + {\lambda _1}} \right)}$
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