Question

give scientific reason in earlier times people used to listen for the arrival of a distance train by putting their ear to the rail​

Answer 1

When people didn’t have digital displays or P.A s, they used to keep their head to the rail. This is because of the speed that the train is coming and the noise it makes, the railway tracks , which are made of steel, vibrate due to the speed and sound. This is the reason, If we keep our ear to the tracks we can hear if the train is coming, though it is not advised to do so.

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Answer 2

Answer:

1. While the train runs on the rail, its wheels bang on the rail and friction occurs.
2. These banging and friction produce vibrations and sound is produced.
3. These vibrations propagate too large distance through a solid medium such as rail that means, the sound travels over a large distance through rail.
4. If ear is put to the rail this sound can be clearly heard and the arrival of a train can be guessed. Thus, in earlier times, people used to listen for the arrival of a distant train by putting their ear to the rail.