Question

give resons ;

i) a person,pressing his ear on the railway tracks can hear an approching train.

ii) astroanuts through taking,sound cannot be heard on moon..
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Answer 1

Answer:

As tracks are solid therefore sound travels faster through tracks than through air and person can hear an approaching train .

Material medium is necessary for the propagation of sound. On the mOon there is vacuum, i.e. no air, therefore sound cannot propagate on the moon. Thus the astronauts can not hear each other.