Electromagnetic spectrum | Definition, Diagram, & Uses | Britannica
Radio Waves | Definition, Characteristics & Examples - Video & Lesson Transcript | Study.com
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Radio Waves - GCSE Physics (9-1) | kayscience.com - YouTube
Radio Waves Used for communications Energy: Low energy Wavelength: a few cm to a few km Frequency: 10 2 Hz to 10 8 Hz Dangerousness: Not dangerous. - ppt download
Radio Waves | Science Mission Directorate
Electromagnetic (EM) Spectrum | Center for Science Education
The Ionosphere
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Introduction to the Electromagnetic Spectrum | Science Mission Directorate