Radio waves are a type of electromagnetic wave with wavelengths longer than infrared light. They have frequencies from 300 GHz to as low as 3 kHz, and corresponding wavelengths from 1 millimeter to 100 kilometers.
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Microwaves: As mentioned earlier these are similar to fast delivery trucks on our highway analogy - smaller and faster than radio "trains" but larger and slower than infrared "vans".
Electromagnetic Spectrum: The classification system for all types of waves, including radio waves. It's our road map showing where each vehicle (wave) belongs.
Frequency: This is the number of complete wave cycles per second. In our analogy, it's like the speed at which our vehicles are traveling.