A) \[6\times {{10}^{6}}m\]
B) \[4\times {{10}^{6}}m\]
C) \[3\times {{10}^{6}}m\]
D) \[2\times {{10}^{6}}m\]
Correct Answer: C
Solution :
Here, \[{{l}_{1}}=50cm,\,\,{{l}_{2}}=51cm,\,\,n=12\] Using the relation for velocity of wave Number of beats \[\upsilon =\left( \frac{1}{{{l}_{1}}}-\frac{1}{{{l}_{2}}} \right)\] or \[12=\upsilon \left( \frac{1}{50}-\frac{1}{51} \right)\] So, \[\upsilon =\frac{12\times 50\times 51}{100}=306m/s\]
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