University of California
Center Science Edu.: Electromagnetic Radiation on Trial
Here is a 1-5 day unit on electromagnetic radiation that features a teacher guide and student activities with extensions.
Mocomi & Anibrain Digital Technologies
Mocomi: What Is Sound?
Defines sound, how it travels, the components of a sound wave, the different types, and other fun facts.
Curated OER
Merriam Webster: Visual Dictionary Online: Wave
Labeled diagram showing the main components of a wave.
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