What are three properties of electromagnetic waves

Answer/Explanation:

They can travel through empty space. (This means if there is no air, it can still travel).

They travel in straight lines. (Think about if you shine a flashlight, it goes straight, not curved. It reflects if it hits something, but then changes direction and continues to travel in straight lines).

They are made of photons. (This is the type of particle the waves are made of).

answer(20) psi;