A) 5
B) 6
C) 7
D) 12
Correct Answer: C
Solution :
Number of beats produced is given by \[\Delta n=\left( \frac{\upsilon }{\upsilon -u}-\frac{\upsilon }{\upsilon +u} \right)n=\left( \frac{2\upsilon u}{{{\upsilon }^{2}}-{{u}^{2}}} \right)n\] or \[\Delta n=\frac{2\times 4\times 332}{{{(332)}^{2}}-{{(4)}^{2}}}\times 300\] or \[\Delta n=\frac{2656\times 300}{110224-16}=\frac{2656\times 300}{110208}=7.22\] \[\Delta n\approx 7\]
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