A) zero
B) 3
C) 6
D) 5
Correct Answer: C
Solution :
Number of beats\[\begin{align} & =n\left\{ \frac{\upsilon }{\upsilon -{{\upsilon }_{s}}}-\frac{\upsilon }{\upsilon +{{\upsilon }_{s}}} \right\} \\ & =240\left\{ \frac{320}{320-4}-\frac{320}{320-4} \right\} \\ & =240\times 320\left\{ \frac{1}{316}-\frac{1}{324} \right\} \\ & =\frac{240\times 320\times 8}{316\times 324}=6 \\ \end{align}\]
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