Today we began our last unit, about light and color. Light is a wave, like the waves that we learned about last unit, except these are electromagnetic waves. There's an electromagnetic spectrum, which holds the range of different wavelengths, frequencies, and energies. This range goes from violet to red, and from a higher frequency to a lower frequency. The higher the frequency is, the more energy it has.
Different electronic devices have different types and frequencies of waves. For example, radios and TV's have a range of about 500 kilohertz to 1000 megahertz. Basically, all you need to hear a certain channel or station is a device that can get to the right frequency. You can even listen in on phone calls by figuring out a certain phones frequency and matching it.
Good job maya! Your post was really informative and it was easy to understand how frequencies of waves work for radio and TV.
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