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Solution for Cite an Experiment to Show that Sound Needs a Material Medium for Its Propagation. - CBSE Class 9 - Science

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Question

Cite an experiment to show that sound needs a material medium for its propagation.

Solution

Take an electric bell and hang this bell inside an empty bell-jar fitted with a vacuum pump (as shown in the following figure).

Initially, one can hear the sound of the ringing bell. Now, pump out some air from the bell-jar using the vacuum pump. It will be observed that the sound of the ringing bell decreases. If one keeps on pumping the air out of the bell-jar, then at one point, the glass-jar will be devoid of any air. At this moment, no sound can be heard from the ringing bell although one can see that the prong of the bell is still vibrating. When there is no air present inside, we can say that a vacuum is produced. Sound cannot travel through vacuum. This shows that sound needs a material medium for its propagation.

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APPEARS IN

 NCERT Science Textbook for Class 9 (with solutions)
Chapter 12: Sound
Q: 3 | Page no. 174

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Solution for question: Cite an Experiment to Show that Sound Needs a Material Medium for Its Propagation. concept: Sound Needs a Medium to Travel. For the course CBSE
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