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Q.

A one meter long (both ends open) organ pipe is kept in a gas that has double the density air at STP. Assuming the speed of sound in air at STP is  300 m/sec. The frequency difference between the fundamental and second harmonic in this pipe is __________ Hz

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answer is 0106.06.

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Detailed Solution

Speed of sound in gas VS=γPρ VgasVair=ρairρgas=12 Vgas=3002                   Vgas=1502 Now       n2−n1=Vgas2l=15022(1)=752=106.06                                            Δn=106.06 Hz
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