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प्रश्न
Describe an experiment to show that sound cannot travel through vaccum.
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उत्तर
- Aim:
To prove that sound cannot travel through a vacuum and it needs a medium for propagation. - Materials Required:
Bell jar, mobile phone, and vacuum pump.
- Procedure:
- Take a bell jar and a mobile phone.
- Switch on the music on the mobile phone and place it in the jar.
- Now, pump out the air from the bell jar using a vacuum pump.
- As more and more air is removed from the jar, the sound from the mobile phone becomes feebler and finally, very faint.
- Conclusion:
This experiment proves that sound cannot travel in vacuum and it needs a medium.
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संबंधित प्रश्न
Name two sources of sound.
What minimum distance is required between the source of sound and the reflecting surface to hear an echo ? Give reason.
Which of the following cannot transmit sound? Water, Vacuum, Aluminium, Oxygen gas
Name the physical qantity whose SI unit is 'hertz'.
What is the name of the strings which vibrate in our voice box when we talk?
Which object is vibrating when the following sounds are produced?
(i) The sound of a sitar
(ii) The sound of a tabla
(iii) The sound of a tuning fork
(iv) The buzzing of a bee or mosquito
(v) The sound of a flute
Describe a simple experiment to show that the prongs of a sound producing tuning fork are vibrating.
Draw the sketches of two waves A and B such that wave A has twice the wavelength and half the amplitude of wave B.
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?
Figure X shows a trace of a sound wave produced by a particular tuning fork :
(a) On the graph paper given in Figure Y, draw a trace of the sound wave which has a higher frequency than that shown in figure X.
(b) On the graph paper show in Figure Z, draw a trace of the sound wave which has a larger amplitude than that shown in Figure X.
