A) increases by a factor 20
B) increases by a factor 10
C) decreases by a factor 20
D) decreases by a factor 10
Correct Answer: B
Solution :
Velocity of sound \[v=n\lambda \] \[\frac{{{v}_{1}}}{{{v}_{2}}}=\frac{{{n}_{1}}{{\lambda }_{1}}}{{{n}_{2}}{{\lambda }_{2}}}\] (but \[{{n}_{1}}={{n}_{2}}\]) \[{{\lambda }_{2}}={{\lambda }_{1}}\frac{{{v}_{2}}}{{{v}_{1}}}={{\lambda }_{1}}\times 10\] \[{{\lambda }_{2}}=10\,{{\lambda }_{1}}\]
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