What are the key characteristics of radio waves

Explanation:

Radio waves are electromagnetic waves that are often created by lightning. Radio waves travel at the speed of light and have frequencies that can reach anywhere between 300 gigahertz to as low as 3 kilohertz. Often used for things like television, radios, or even navigation.

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magnityde and direction

real, smaller and upside-down.   so the answer should be b.