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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.
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
Explain how sound is produced by your school bell.
What is sound and how is it produced?
Name two sources of sound.
Which characteristics of the sound helps you to identify your friend by his voice while sitting with others in a dark room?
Which of the following cannot transmit sound? Water, Vacuum, Aluminium, Oxygen gas
State whether the following statement is true or false :
Sound produced by a vibrating body travels to our ears by the actual movement of air.
A tuning fork has a number 256 marked on it. What does this number signify?
Give reason for the following :
In most of the cases, we cannot see the vibrations of a sound producing object with our eyes.
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?
What is vibration?
