Question

Electromagnetic waves are composed of _______.

repelling electrons and neutrons


protons emitted by stationary electrons


photons emitted by moving electrons


protons and neutrons

Answer 1

Photons emitted by moving electrons.

Step-by-step explanation:

Moving electron produces a photon. Electrons emit photons when it moves from higher energy state to lower energy state. light is a bunch of photons.

Since light is an electromagnetic wave. And carries photon which has no mass but energy. And that energy is related to frequency of electromagnetic wave.

So, electromagnetic waves must be composed of photons emitted by moving electrons.