Which of the following statements is not a reason why when visible light is used for communications it must be transmitted through fiber cables rather than through the atmosphere?
Different types of long-wavelength electromagnetic waves, , , and , all used for long distance communication, are shown in the diagram.
Which of , , and shows microwaves?
Which of , , and shows long-wave radio waves?
Which of , , and shows short-wave radio waves?
Which of the following statements most correctly describes how microwave communication signals propagate?