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PRACTICE · MEMBERSIntermediate · Single correct

PRACTICE / Open and closed pipes

The next resonance skips a harmonic

A closed-open pipe has fundamental frequency 120 Hz.

Find its next allowed resonance frequency.

Organize the givens & assumptions
  • f₁ = 120 Hz
  • one closed end

Uniform pipe with one end closed and one open; ideal pressure/displacement boundaries and negligible end correction.

  1. A240 Hz240\ \mathrm{Hz}
  2. B480 Hz480\ \mathrm{Hz}
  3. C120 Hz120\ \mathrm{Hz}
  4. D360 Hz360\ \mathrm{Hz}

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