Sources of electromagnetic waves

Answer 1

Many of the EM waves present on earth's environment come from the sun. The sun's high temperature allows it to give off countless EM waves. In addition to the sun , technology is a source of EM waves that humans use for a wide variety of purposes..

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Answer 2

Electromagnetic waves are generated whenever electric voltage is applied to a conductive material. In an antenna there is both voltage and current. Since the energy has nowhere to go it creates a field around the conductor. When the voltage is reversed some of the energy escapes as electromagnetic waves. Another useful source is the magnatron in a microwave oven. Same principle but the wavelength is shorter.

Answer 3

answ2. Lightning, volcanic emissions, aurorae.