Science Fair Projects World

Investigating the Doppler Effect




Demonstrate and analyze the Doppler effect using sound waves.


  • Tuning fork or sound source
  • Microphone or sound sensor
  • Timer
  • Notebook for recording data


  1. Generate a constant sound using a tuning fork or another sound source.
  2. Move the sound source toward and then away from the microphone or sound sensor at a constant speed.
  3. Record the frequency of the sound as detected by the microphone.
  4. Repeat the experiment at different speeds and distances.
  5. Analyze the changes in frequency to understand the Doppler effect.
  6. Present your findings in a report, explaining the Doppler effect and its applications in various fields.