A) 300 m/s
B) 30 m/s
C) 303 m/s
D) none of these
Correct Answer: B
Solution :
\[{{f}_{1}}\,=\,\,\frac{c}{2{{l}_{1}}}\] \[{{f}_{2}}\,=\,\,\frac{c}{2{{l}_{2}}}\] \[\therefore \,\,\,\,{{f}_{1}}-{{f}_{2}}=\frac{c}{2}\,\left( \frac{1}{{{l}_{1}}}-\frac{1}{{{l}_{2}}} \right)\] \[0.3\,\,=\,\,\frac{c}{2}\,\,\left( \frac{1}{50}-\frac{1}{50.5} \right)\] \[\therefore \,\,\,c=3030\,cm/s\,\,=\,\,30\,\,m/s\]:.
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