Some properties that make radio waves and microwaves the same are:
They are produced when a current flows in an aerial which spread out and travel throughout the atmosphere.
Another similar property is that they are not strongly absorbed by the atmosphere.
They are on the electromagnetic spectrum; very long waves and close together on that spectrum.
Radio and microwaves can be used for communications. They also travel through the air at the same speed 3x10^8 m/s
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