17. a mechanical wave cannot pass through\na a vacuum\nb gases\nc solids\nd liquids
17. a mechanical wave cannot pass through\na a vacuum\nb gases\nc solids\nd liquids
Answer
Brief Explanations:
Mechanical waves require a medium to propagate. Solids, liquids, and gases can act as media. But a vacuum has no particles, so mechanical waves cannot pass through it.
Answer:
A. A vacuum