Question

describe a simple experiment to show that sound cannot propagate through vacuum

Answer 1

You can conduct an experiment known as THE BELL-JAR EXPERIMENT

For this
*Take a jar ,put an electric bell inside it .
* Create vacuum in it.
*Turn on the bell .
*You will notice that no sound can reach your ear.
This is because of the fact that sound needs a material medium to propagate.

Answer 2

The Bell-Jar Experiment -->

Objective :
To show sound can't propagate through vacuum

Apparatus Required :
1) A glass jar
2) Electronic Bell
3) Vacuum pump
4) Switch (electric connection)

Procedure :

1) An electric bell is taken inside an airtight glass jar.
2) It is suspended inside the jar.
3) The jar is connected to a vacuum pump.
4) The switch is on and air is started to be pumped out.

Observations :

1) At first we can hear the sound of bell clearly.
2) As soon as air is pumped out, the sound of bell starts to become feeble
3) After the air is completely vacated out, no sound is heard.

Conclusion :

 This means as a vacuum is created in the jar, no sound is heard.This means sound always requires a material medium to travel.

Hope This Helps You!
Do see the image I have attached!