Both carry energy. Both travel in vacuums. Both are caused by vibrations. Both are traveling at the same speed.
I gave my students this multiple choice question: What is a similarity between sound waves and light waves?

Only one answer is correct among these 4 choices:
- Both carry energy.
- Both travel in vacuums.
- Both are caused by vibrations.
- Both are traveling at the same speed.

Could you tell me which one is correct?

Both carry energy.