Question

5. Explain the experiment, with neat
diagram, to prove the following:
'Sound needs material medium for
propagation. Please tell me and this is question of std 8 Science Lesson No 15​

Answer 1

Answer:

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Explanation:

Bell-jar experiment demonstrates that sound needs a medium for its propagation.Take an electric bell and an air tight glass bell jar connected to a vacuum pump. Suspend the bell inside the jar, and press the switch of the bell. You will be able to hear the bell ring. Now pump out the air from the glass jar. The sound of the bell will become fainter and after some time, the sound will not be heard. This is so because almost all air has been pumped out.This shows that sound needs a material medium to travel.

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Answer 2

Here is your answer and diagram

Answer:

Bell jar experiment can prove that sound needs material medium for its propagation.

Construction

A bell jar

A vacuum pump connected to the jar through a tube

An electric bell inside the jar and is connected to the electric supply through the lid of the bell jar

Working

Initially the vacuum pump is 'OFF' so that air is present inside the jar. Now, if electric supply is switched on, the electric bell will start ringing and this ringing can be heard outside the bell jar.

Now, switch on the vacuum pump such that it starts sucking the air inside the jar. It will be observed that, with the decrease in quantity of air inside the jar, the level of ringing sound heard outside also decreases. If the pump is used for sufficiently long period, then the quantity of air inside the jar will be so low that the ringing sound outside it will not be audible. This proves that sound requires medium for its propagation.

Explanation:

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