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प्रश्न
What is approximate value of the speed of sound in iron as compared to that in air? Illustrate your answer with a simple experiment.
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उत्तर
Speed of sound in iron is approximately sixteen times the speed of sound in air.
[Speed of sound in iron = 5100 ms-1; Speed of sound in air=332 ms-1]
Experiment: If we put our ears to rails, we can hear the sound of the train through metal. But at the same time, when we stand near by the railway track, we are not able to hear the sound.
This occurs because when we put our ears to rails, the sound travels through iron. But in standing position, sound travels through air, and due to smaller speed of sound in air as compared to iron, we are not able to hear the sound.
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संबंधित प्रश्न
Write true or false for a given statement.
Sound can only be produced by vibrating bodies.
Write true or false for a given statement.
Loudness depends on frequency.
What type of waves are illustrated by the movement of a rope whose one end is fixed to a pole and the other end is moved up and down?
Give two examples each of longitudinal waves and transverse waves.
In an experiment, Anhad studies sound waves. He sets up a loudspeaker to produce sound as shown below :
Anhad adjusts the signal to the loudspeaker to give a sound of frequency 200 Hz.
(a) What happens to the air in-between Anhad and the loudspeaker ?
(b) Explain how Anhad receives sound in both ears.
Vibrations in a body produce ______.
Explain the types of mechanical waves.
What is a wave?
How do we hear the sound?
Give scientific reason.
In earlier times, people used to listen for the arrival of a distant train by putting their ear to the rail.
