In this activity, students make a hydrophone and use it to listen to underwater sounds.

By the end of this activity, students should be able to:

  • understand how to modify an electret microphone to be used underwater
  • describe differences in how sounds are heard under water and above water in the air

Download the Word file for:

  • introduction/background notes
  • instructions on what you need and what to do
  • discussion questions
  • extension ideas.
    Published 10 May 2011