AP Physics 1 Question 262: Answer and Explanation

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Question: 262

8. An organ pipe that's closed at one end has a length of 17 cm. If the speed of sound through the air inside is 340 m/s, what is the pipe's fundamental frequency?

  • A. 250 Hz
  • B. 500 Hz
  • C. 1,000 Hz
  • D. 1,500 Hz

Correct Answer: B



An air column (such as an organ pipe) with one closed end resonates at frequencies given by the equation fn = nv/(4L) for odd integers n. The fundamental frequency corresponds, by definition, to n = 1. Therefore,