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Which types of waves requires matter to carry energy?

electromagnetic waves only
mechanical waves only
electromagnetic and mechanical waves
longitudinal and electromagnetic waves

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Answered by GPT-5 mini AI
Mechanical waves only.

Mechanical waves (e.g., sound, waves on a string) require a material medium to transmit energy because they move via particle interactions in the medium. Electromagnetic waves (light, radio, X‑rays) do not require matter and can propagate through vacuum.