Question
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
✓
Answer
In same media, speed of sound will be same speed
$\mathrm{v}=\mathrm{f}_{1} \lambda_{1}=\mathrm{f}_{2} \lambda_{2}$
now Beats $=\mathrm{f}_{1}-\mathrm{f}_{2}$
$\mathrm{n}=\frac{\mathrm{v}}{\lambda_{1}}-\frac{\mathrm{v}}{\lambda_{2}} \mathrm{v}=\frac{\mathrm{n} \lambda_{1} \lambda_{2}}{\lambda_{2}-\lambda_{1}}$
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