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प्रश्न
Explain why you can predict the arrival of a train by placing your ear on the rails without seeing it.
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उत्तर
The sound produced by the moving wheels of train travels much faster through the track than through the air. Therefore they hear through the track much before it is heard through the – air.
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संबंधित प्रश्न
How does the sound produced by a vibrating object in a medium reach your ear?
Select the correct alternative :
Sound travels the fastest in
Describe an experiment to estimate the speed of sound in air.
Can sound travel through (a) iron, and (b) water?
Name the physical qantity whose SI unit is 'hertz'.
Name four ways in which sound can be produced.
A sound producing body is at considerable distance from a man. There can be four different media W, X, Y and Z between the sound producing body and the man. The medium X brings the sound to man most quickly whereas medium Z takes the maximum time. The time taken by medium W in bringing sound to man is less than that of X but more than that of Z. The medium Y, however, fails to bring the sound from the sound producing body to the man. Which medium could be the one :
(a) having on fixed shape and no fixed volume?
(b) having a fixed volume but no fixed shape?
(c) having the same composition as that on the moon?
(d) having a fixed shape and a fixed volume?
Write the answer in your own words.
What is meant by vibration?
Sound is produced by ______.
You and your friend are on the moon. Will you be able to hear any sound produced by your friend?
