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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
Describe an experiment to show that each source of sound is a vibrating body.
Name two sources of sound.
Name the physical qantity whose SI unit is 'hertz'.
What will be the change in the wavelength of a sound wave in air if its frequency is doubled?
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
How does sound from a sound producing body travel through air to reach our ears? Illustrate your answer with the help of a labelled diagram.
Which of the following vibrates when a musical note is produced by the cymbals in an orchestra?
A musical instrument is producing a continuous note. This note cannot be heard by a person having a normal hearing rang. This note must then be passing through.
A key of mechanical piano is first struck gently and then struck again but much harder this time. In the second case :
Match the following:
| Human larynx | Vibrations of metal arms |
| Loudspeaker | Vibrations in air column |
| Jal-Tarang | Vibrations in vocal cords |
| Tuning fork | Vibrations in strings |
| Sitar | Vibrations of screen |
