The wavelength of a particle is $99 cm$ and that of other is $100 cm$ Speed of sound is $396 m/s$. The number of beats heard is
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(a) $\Delta n = v\left[ {\frac{1}{{{\lambda _1}}} - \frac{1}{{{\lambda _2}}}} \right] = 396\,\left[ {\frac{1}{{0.99}} - \frac{1}{1}} \right] = 3.96 \approx 4.$
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