Between 7:30 and 10:00 PM, on evenings when the transmitter is turned on. Radio waves travel whenever the radio transmitter is turned on. It can be on 24 hours a day, or it can be turned on and off whenever the station management feels like it. Some AM stations are called "Daytime" stations, which means they must turn their transmitters off or down to a low wattage at dusk and then turn the transmitter back up to full power at daybreak. There are radio waves traveling throughout the universe that are not manufactured by a human made transmitter. They are made by nature and they travel 24 hours a day, seven days a week.
raDIO WaVES
radio waves do not require a medium to travel,it can even travel through vaccum
Radio waves travel through empty space because they are electromagnetic waves, whereas sound is a wave that must travel through air.
radio astronomy
radio astronomy
sound waves
To infinity and beyond.
Radio waves mate
No. The GPS signal is high-frequency radio waves. High frequency radio waves cannot travel through water.
light waves do not need a medium. Electromagnetic Waves (EM) do not need a medium. For example visible light, radio waves, microwaves, UV light and x-rays do not. These travel @ 300 million meters/sec in a vacuum.
All electromagnetic waves, including radio.
Radio waves are just low frequency light waves. They travel at the speed of light, much faster than sound waves which are just changes in pressure traveling in waves