Answer:
Radio waves
- have wavelengths of 1 m up.
- The frequency at 1 m is 300 MHz.
- are produced by a vibrating electric current in an antenna.
- are good at broadcasting (sending out to lots of receivers) and that is how we get to listen to radio and TV broadcasts.
- Radio waves with wavelengths of kilometers diffract
over hills and through valleys so you can easily get reception.
- radio waves are good at "broadcasting" to many people
Microwaves
- have wavelengths of 1 mm (millimeter) to 1 m.
- The frequency at 1 mm is 300 GHz.
- We use radio and microwaves to communicate without wires.
- Microwave ovens use electromagnetic waves at a frequency of 2.45 GHz (wavelength about 12 cm) that make water molecules vibrate fast and heat up.
- can travel through glass and plastic and penetrate about a centimeter into food (depending on the food), but bounce off metal surfaces.
- microwaves are good at point-to-point communication.
(hope it helps)
