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Sound waves need to travel through medium such as a solid, liquid, or gas. The sound waves move through each of these mediums by vibrating the molecules in the matter. The molecules in solids are packed very tightly. ... sound travels about four times faster and farther in water than it does in air.

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The railway tracks are made of metals which are solids. The particles a re tightly packed hence the sound can pass through the molecules. The metal has high density hence the sound can pass.:-)

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Solids are more denser than liquids and gases so sound travels faster in solids than in liquids and gases
Solids are tightly packed this is also one of the reasons for  it to travel fast...

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The molecules in solids are packed very tightly. Liquids are not packed as tightly as solids. And gases are very loosely packed. The spacing of the molecules enables sound to travel much faster through a solid than a gas. Sound travels about four times faster and farther in water than it does in air. This is why whales can communicate over huge distances in the oceans. Sound waves travel about thirteen times faster in wood than air. They also travel faster on hotter days as the molecules bump into each other more often than when it is cold.

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In solids the molecules are tightly packed ,which allows sound to travel faster from one molecule to another.

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☢The denser the object the faster the sound waves will travel hence the sound will be greater when we keep our ears in an object we hear the sound greater
☢Sound

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Molecules of solid is tightly packed in solids whereas molecules are loosely packed in air therefore sound travels faster in solids...
Eg: trackers listen to horses coming by putting their ear in the ground

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⭐️😄To hear the sound waves travel through different objects . Molecules are tightly packed
The denser the object the faster the sound waves will travel.⭐

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It is because the molecules of solid are tightly packed while the molecules in air are very loosely packed

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Q1)In solids the particles are tightly packed and they release kinetic energy therefore we feel the  vibrations on solids.There are many factors that affecting sound one of the main factor is viscosity of the object.
eg; railway tracks

Q2) Compression is a region in a longitudinal wave where the particles are closest together.
Rarefaction is the region in the longitudinal wave where the particles are furthest apart.

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Molecules are loosely packed in air so sound dosent travel fast. But in solids that is the railway track the molecules are tightly packed thus the sound travels faster