(a) When we put our ear to a railway line, we can hear the sound of an

1.	(a) When we put our ear to a railway line, we can hear the sound of an approaching train even when the train is far off but its sound cannot be heard through the air. Why ? (b) How could you convince a small child that when you speak, it is not necessary for air to travel from your mouth to the ear of a listener ?
Answer» (a) When we put our ear to a railway line, we can hear the sound of an approaching train even when the train is far off but its sound cannot be heard through the air. Why ? (b) How could you convince a small child that when you speak, it is not necessary for air to travel from your mouth to the ear of a listener ?

(a) When we put our ear to a railway line, we can hear the sound of an approaching train even when the train is far off but its sound cannot be heard through the air. Why ? (b) How could you convince a small child that when you speak, it is not necessary for air to travel from your mouth to the ear of a listener ?

Answer»

(a) When we put our ear to a railway line, we can hear the sound of an approaching train even when the train is far off but its sound cannot be heard through the air. Why ?

(b) How could you convince a small child that when you speak, it is not necessary for air to travel from your mouth to the ear of a listener ?

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