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Question

Four open organ pipes of different length and different gases at same temperature as shown in figure. Let fA , fB , fC and fD be their fundamental frequencies then:–text  [Take  end text open gamma subscript C O subscript 2 end subscript end subscript equals 7 divided by 5 close square brackets

  1. f subscript A end subscript divided by f subscript B end subscript equals square root of 2    
  2. f subscript B end subscript divided by f subscript c end subscript equals square root of 72 divided by 28 end root    
  3. f subscript c end subscript divided by f subscript D end subscript equals square root of 11 divided by 28 end root    
  4. f subscript D end subscript divided by f subscript A end subscript equals square root of 76 divided by 11 end root    

The correct answer is: f subscript c end subscript divided by f subscript D end subscript equals square root of 11 divided by 28 end root

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