The source is the RF current in the transmitting antenna.
A stellar source of periodic radio signals is called quasar. This runs off of radio waves.
Microwave frequency radio waves are usually produced by a MAGNETRON.
A lightbulb does not utilize radio waves. It emits visible light when connected to an electrical power source.
Sound is effected by air pressure and temperature and the movement of the source. Light and radio waves are virtually unaffected by the air.
Are you thinking of a "quasar" ?
Radio waves themselves are not inherently spherical; rather, they propagate in the form of electromagnetic waves that can have various shapes depending on the source and environment. When emitted from a point source, such as a radio antenna, radio waves typically radiate outward in a spherical pattern, creating expanding spherical wavefronts. However, the actual shape and propagation can be influenced by factors like antenna design, frequency, and surrounding materials.
In a radio, electrical energy from a power source is converted into electromagnetic energy (radio waves) by the transmitter. The radio's antenna captures these radio waves and converts them back into electrical signals, which are then converted into sound waves by the speakers, thus transforming the energy back into sound energy for us to hear.
no, mechanical waves are not radio waves
Objects such as light bulbs, the sun, and electronic devices emit electromagnetic waves. These waves can range from radio waves to gamma rays depending on the source.
Radio waves ARE electromagnetic waves.
Transverse. Radio waves are electromagnetic waves, which are transverse.
No. Radar waves are one category of radio waves. Think of all the radio waves that are all around you right now . . . AM radio, FM radio, police and fire radio, highway patrol radio, taxi radio, television picture and sound radio waves, cellphone radio waves, garage-door-opener radio waves, bluetooth radio waves, WiFi waves, microwaves ... and you can't see any of them ! Radar waves can easily be there in the group.