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The true statement is

1. Sound waves in air are transverse waves
2. Sound wave does not required a material medium for its propagation
3. Sound travels faster in gas than in solid
4. Sound travels faster in solid than in gas

Correct answer: Sound travels faster in solid than in gas

Solution

Sound is a mechanical wave, so it needs a material medium to travel. It moves fastest in solids because particles are closely packed and transmit vibrations more efficiently than in gases.

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