A) \[3.2\,cm\]
B) \[4.2\,m\]
C) \[4.2\,cm\]
D) \[3.2\,m\]
Correct Answer: B
Solution :
Velocity of sound in air \[\upsilon =330\,m/s\] As we are quite well known that the lowest frequency of audible sound is 20 Hz. Hence maximum length of a closed pipe to produce just audible sound is given by \[l=\frac{336}{4v}=\frac{336}{4\times 20}=4.2\,m\]
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