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General
Easy

Question

On producing the waves of frequency 1000 Hz in a Kundt’s tube, the total distance between 6 successive nodes is 85 blank c m.Speed of sound in the gas filled in the tube is

  1. 330 m/s    
  2. 340 m/s    
  3. 350 m/s    
  4. 300 m/s    

The correct answer is: 340 m/s


    Distance between six successive node
    equals fraction numerator 5 lambda over denominator 2 end fraction equals 85 c m rightwards double arrow lambda equals fraction numerator 2 cross times 85 over denominator 5 end fraction equals 34 blank c m equals 0.34 blank m
    Therefore speed of sound in gas
    equals n lambda equals 1000 cross times 0.34 equals 340 blank m divided by s

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