Sound from a small bell is heard inside a swimming pool when the bell is rung underwater. This happens because:
ASound can travel through water — a liquid medium
BThe pool walls amplify the bell
CThe bell pushes air through the water
DUnderwater sound travels faster than light
Answer & Solution
Correct answer: A. Sound can travel through water — a liquid medium
Liquids are a valid medium for sound. The bell's vibrations are transmitted through water particles all the way to your ear (the chapter's Activity 10.8 demonstrates exactly this). It is also why whales and dolphins can communicate over long distances underwater.
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