\Parts of a device that use radio waves. On the left is a box labeled A. On the right is a box labeled B. There is a vector pointing up from Box A and a vector pointing down to Box B. Arrows pointing left from Box A to Box B are labeled Radio waves travel through the air.
Which part, A or B, captures, amplifies, and demodulates radio waves?

Which part , A or B, modulates, amplifies, and sends out radio waves?

Radio waves are the type of radiation from the electromagnetic spectrum.
The radio waves can be used in communication technologies like computer, phones, radios , etc..
Radio waves have lower frequencies but longer wavelength.
These devices will get signal and then it transmit as mechanical waves through sound.

In that way, the radio waves from box A to B through air, the box A will gets the signal, and then modulates, amplifies and then it send out radio waves. Through the air, Box B will captures, amplifies and demodulates radio waves.

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