How are radio waves emitted?
How are radio waves produced? Can I make them at home?
How do we convert electrical energy into radio waves? How do radio waves work in space? What are some of the dangers of radio waves? Why can't radio waves transmit through water? Can I use a TV antenna to pick up higher-frequency radio waves? What are the dangers of radio wave transmission? Why is communication on radio waves costly? How do speakers produce sound waves? How do you create a simple radio wave generator? Why does sound need a medium like air or water in order to travel, but radio waves do not? What happens if you modulate a radio signal at radio frequency? What makes radio different from the other forms of media? What is the difference between AM and FM radio waves? How do walkie-talkies use radio waves? Could we use 13cm wavelength radio waves to see a message in a paper? What are the examples of radio frequency system? Can sound waves vibrate light waves? Can radio waves and microwaves penetrate soil/rock/walls/metal? What are some Android apps for radio? Are insects able to feel radio waves? Could we use a radio waves of 100 or 1 meter wavelength to read a message written in a paper? How many stars have human made radio waves reached? What percent of our galaxy does that represent? Could we use radio waves and microwaves (with enough small wavelength) to read a message in a wrinkled paper, metal or a rock? What are sound waves? What is radio frequency? Could sound waves leave traces in any surface or medium? Do microwaves put radiation in food? How do I create Internet radio in Android? How or why do radio waves reflect the ionosphere?  Do we need any medium to transport electromagnetic waves?