Where is electromagnetic energy found?

Answer 1

I prefer not to use the word "stored," because EM radiation does not "store" energy -- it transfers it. The energy shifts from the electric field of the EM wave to the magnetic field of the EM wave, and then back -- repeat ad infinitem.

Answer 2

The wavelength range over which such waves are observed called electromagnetic spectrum. The term electric wave, or hertzian wave, is often applied to electromagnetic waves in the radar and radio range.

Electromagnetic waves may be confined in tubes, such as wave guides, or guided by transmission lines.

The sources of classical electromagnetic waves are accelerating electric charges

A common example is the generation of radio waves by oscillating electric charges in an antenna. When a charge moves in a linear antenna with an oscillation frequency f, the oscillatory motion constitutes an acceleration, and an electromagnetic wave with the same frequency propagates away from the antenna

Generally, EM radiation is classified by wavelength into radio wave, microwave, infrared, the visible region we perceive as light, ultraviolet, X-rays and gamma rays.

Television, mobile phones, wireless networking and amateur radio all use radio waves.

In a microwave oven, this effect is used to heat food. Low-intensity microwave radiation is used in Wi-Fi, although this is at intensity levels unable to cause thermal heating.

Gamma rays are also used for the irradiation of food and seed for sterilization, and in medicine they are used in radiation cancer therapy and some kinds of diagnostic imaging such as PET scans.

Answer 3

It can be found just about everywhere in the universe. Light is an electromagnetic wave and is in the electromagnetic spectrum.