In free space, radio waves travel at the speed of light. In a material, such as co-ax cable, the speed is much lower, perhaps as low as 0.6 of the speed of light. Special arrangements may lower its speed even further.
radiowave+radiowave
void and electricity make radiowave
radiowave+radiowave= radiation
To make the cellphone you need to put radiowave and computer together (radiowave and computer)
The frequency does not change the speed the signal travels. For most math books, the speed of light is indicated as 300,000 km/s (actually 299,792,458 m/s). So the formula is Time (sec) = Distance (km) / c (300000 km/s). 80,000,000 / 300,000 = 266 2/3 seconds or 4 minutes and 26 2/3 seconds.
Void + electricity
lightbulb+radiowave :D
Radiowave + lightbulb = tv
Void + electricity = Radio Wave
Radiowave + Fire = Lazer
communicationRADARheating foodmedical heating therapyetc.
For transmission through a radiowave.