The cheapest form of radiation is - solar. If you spend any time outside you will get solar radiation but there is no monney to pay.
Like anything enjoy in moderation.
polythene is cheapest form of polymer
The cheapest form of personal transportation available is typically walking.
cheapest
The quickest and cheapest form of transport over short distances is the elevator
It is a form of electromagnetic radiation.
Visible light is a form of electromagnetic radiation that is visible.
Infrared radiation.
Electromagnetic radiation.
Yes, a photon of light is a form of electromagnetic radiation.
Yes, radio waves are a form of electromagnetic radiation.
Gamma Radiation
Yes, but not ionizing (nuclear) radiation.