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PRACTICE · MEMBERSIntermediate · Single correct

PRACTICE / Doppler effect

A moving source compresses wavefronts

A source emits 300 Hz while moving toward a stationary listener at 34 m/s through still air.

Find the heard frequency.

Organize the givens & assumptions
  • f = 300 Hz
  • vs = 34 m/s
  • v = 340 m/s

Sound speed 340 m/s in still air; source approaches along the line of sight at 34 m/s; listener stationary in air.

  1. A1000/3 Hz1000/3\ \mathrm{Hz}
  2. B330 Hz330\ \mathrm{Hz}
  3. C300 Hz300\ \mathrm{Hz}
  4. D3000/11 Hz3000/11\ \mathrm{Hz}

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