Both transfer energy. Both require a vacuum. Both have the same speed. Both have the same frequency.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of the following is a similarity 20 between x-ray waves and sound waves?
Possibilities:
- Both transfer energy.
- Both require a vacuum.
- Both have the same speed.
- Both have the same frequency.

Both transfer energy.