A) 14
B) 10
C) 24
D) None of these
Correct Answer: A
Solution :
\[{{v}_{0}}=332\] m/s. Velocity sound at t°C is \[{{v}_{t}}=({{v}_{0}}+0.61\,t)\] Þ \[{{v}_{20}}={{v}_{0}}+0.61\times 20=344.2\]\[m/s\] Þ \[\Delta n={{v}_{20}}\left( \frac{1}{{{\lambda }_{1}}}-\frac{1}{{{\lambda }_{2}}} \right)\]\[=344.2\left( \frac{100}{50}-\frac{100}{51} \right)=14\]
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