Question

write an experiment to demonstrate that sound need a medium to travel

Answer 1

Materials needed:tall glass jar,bell,candle

Method:take a glass jar. attach a small bell to the bottom of the cap of the jar. close the jar with the cap. shakethe bottle and note the sound made by bell. now open the jar,place lighted candle in it and close thr jar again. wait for the candle to be extinguished. shake the bottle again. the sound is not produced.

the oxygen is taken up by the candle.
so the bell does not produce any sound.

This proves that sound needs a medium to travel.
HOPE THIS HELPS!!
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Answer 2

Hey there (^-^) ,
Let us do some activities :)

ACTIVITY :
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► Aim :

To show that Sound cannot travel through vacuum.

► Materials Required :

A bell jar, electric bell, cotton thread or rubber band, a cork.

► Procedure :

Take the bell jar, Suspend an electric bell inside it with the help of a cotton thread or rubber band through an air tight cork [as shown in figure].

Connect a vacuum pump through another opening in the jar. Connect the bell to a battery through a key ( push bottom switch ).

Initially, the bell jar is full of air. Now press the switch. The bell starts ringing and you can hear its sound clearly.

Now, pump out the air from the bell jar gradually by switching on the vacuum pump attached in it.

► Observation :

You will notice as more and more air is removed from the bell jar, the sound of the bell becomes fainter and fainter. and when a vacuum is created , no sounds is heard, in spite of the fact that hammer is striking against the gong of bell.

Stop the vacuum pump and allow the air to enter into the bell jar. You will be able to hear the sound of the ringing bell again.

► Conclusion :

Sound cannot travel through vacuum, it always need a medium to propagate.

This Experiment Shows that :

◆ Sound cannot travel through vacuum, but can travel through air.

◆ Thus, a material medium is necessary for the propagation of sound.

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Hope my answer helped ;)

Cheers !