Question

which types of waves requires matter to carry energy?
electromagnetic waves only
mechanical waves only
electromagnetic and mechanical waves
longitudinal and electromagnetic waves

Explanation:

Mechanical waves, like sound waves, need a medium (matter) to propagate and carry energy. Electromagnetic waves (e.g., light) can travel through a vacuum (no matter). Longitudinal waves are a type of mechanical wave (but the key is the requirement of matter). So only mechanical waves require matter to carry energy.

Answer:

mechanical waves only