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    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 Referencing Hub articles