What do electromagnetic waves transfer from their source to their observer?

Electromagnetic waves transfer energy from their source to their observer. This energy is carried through space by the electromagnetic waves. Here's a step-by-step explanation:

1. The process begins with an energy source, such as the sun or a radio station transmitter. This source creates electromagnetic waves.

2. These waves then travel through space at the speed of light. They can do this because they are self-propagating, meaning they can move through space without needing a medium (like air or water) to travel through.

3. As the waves travel, they carry energy with them. This energy is in the form of electric and magnetic fields that oscillate as the wave moves.

4. When the waves reach an observer (like your eyes, or a radio antenna), they transfer this energy to the observer. This can be in the form of light energy (for visible light waves), heat energy (for infrared waves), or other forms of energy depending on the type of wave.

5. The observer then uses this energy. For example, your eyes use the energy in visible light waves to see, and a radio uses the energy in radio waves to produce sound.