Sound waves actually travel faster in solids than in most other mediums, such as liquids and gases. This is because solids are more rigid and have closely packed particles, allowing the energy from sound waves to be transmitted more efficiently.
To clarify the options you provided:
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They travel slower in a solid than other mediums - This is incorrect. Sound travels faster in solids.
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They stop when they hit a solid - This is also incorrect. Sound waves can reflect, refract, or transmit when they encounter a solid, but they do not simply stop.
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They travel faster in a solid than other mediums - This is correct. Sound waves travel fastest in solids.
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Sound waves behave the same in any medium - This is incorrect. Sound wave behavior varies significantly across different mediums (solids, liquids, gases).
So the correct statement is that sound waves travel faster in a solid than in other mediums.