A) 300 m/s
B) 310 m/s
C) 320 m/s
D) 330 m/s
Correct Answer: A
Solution :
\[\Delta n=\frac{30}{3}=10\,Hz\] \[\Delta n=v\left[ \frac{1}{{{\lambda }_{1}}}-\frac{1}{{{\lambda }_{2}}} \right]\] \[10=v\left[ \frac{1}{5}-\frac{1}{6} \right]\] \[v=300\text{ }m/s\]
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