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A closed organ and an open organ tube are filled by two different gases having
same bulk modulus but different densities ρ1 and ρ2, respectively. The frequency
of 9th harmonic of closed tube is identical with 4th harmonic of open tube. If the
length of the closed tube is 10cm and the density ratio of the gases is ρ1: ρ2=
1: 16, then the length of the open tube is:
a) 15
7
cm b) 20
7
cm c) 15
9
cm d) 20
9
cm
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