A) 300 ms?1
B) 310 ms?1
C) 320 ms?1
D) 330 ms?1
Correct Answer: A
Solution :
No of beats, x =\[\Delta n=\frac{30}{3}=10\,Hz\] Þ Also\[\Delta n=v\left[ \frac{1}{{{\lambda }_{1}}}-\frac{1}{{{\lambda }_{2}}} \right]=v\,\left[ \frac{1}{5}-\frac{1}{6} \right]\]=10Þ\[v=300\]m/s
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