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Q.

Is it true that the sound of a train running on the track reaches through the track earlier than through the air?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is True.
The sound is produced by the vibrations of the inter particles of the object. Sound waves are mechanical waves which need media for propagation. The closer the particles are, the faster will be the energy transfer between the particles and the higher will be the speed of sound waves. For example, railway tracks are made of iron, and iron is a more dense material than air. So the sound wave travels faster in the iron than in the air.
 
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