They have very short wavelengths. They transmit energy instead of matter. They can travel through a vacuum and through matter. They can change direction by reflection when they strike an object.
I gave my students this multiple choice question: How are electromagnetic waves different from other waves?

Only one answer is correct among these 4 choices:
- They have very short wavelengths.
- They transmit energy instead of matter.
- They can travel through a vacuum and through matter.
- They can change direction by reflection when they strike an object.

Could you tell me which one is correct?

They can travel through a vacuum and through matter.