A pipe closed at one end is 1.0m long. The air in the pipe is set into vibration and a fundamental note of frequency 85Hz is produced. Calculate the velocity of sound in the air. (Neglect end correction).

  • A 340.0ms-1
  • B 33Oms-1
  • C 170ms-1
  • D 85.0ms-1
  • E 42.5ms-1

The correct answer is A. 340.0ms-1

L = λ/4; λ= 4 = 4m

v = fλ = 85 x 4 = 340ms-1

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