What are radio waves? What are some examples?
What are the properties of radio waves?
What are some of the dangers of radio waves? How do radio waves work in space? Why are radio waves transverse? Can radio waves be converted into electrical waves? Why can't radio waves transmit through water? Why do radio waves travel at the speed of light and not sound? What are the dangers of radio wave transmission? How do we convert electrical energy into radio waves? What is the difference between AM and FM radio waves? What are waves? How or why do radio waves reflect the ionosphere?  Why is communication on radio waves costly? What makes radio different from the other forms of media? What happens if you modulate a radio signal at radio frequency? Are electromagnetic waves and sound waves related? Where exactly inside the antenna can be the cause of radio frequency propagation? What is radio frequency interference? Why does sound need a medium like air or water in order to travel, but radio waves do not? Could we use 13cm wavelength radio waves to see a message in a paper? What are some waves which require a medium? What is radioactivity? Describe the layers of the atmosphere. What type of radio communication utilizes each of them? What is radio amplitude modulation? Why does the ionosphere reflect radio waves? What is wave and vibration? Could we use a radio waves of 100 or 1 meter wavelength to read a message written in a paper? What type of waves are light waves? What are non-mechanical waves? What are transverse and longitudinal sound waves? Can radio waves and microwaves penetrate soil/rock/walls/metal?