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Question

Can sound travel through vacuum? Describe an experiment to explain your answer.​

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Solution

No, sound cannot travel through vacuum. This is because sound needs a medium to travel through.​

Experimental set up:​

Procedure:​

  1. Take an electric bell and an airtight glass jar which is connected to a vacuum pump.​
  2. Suspend the electric bell in the jar.​
  3. Connect the bell to a battery, the bell starts ringing and a sound is heard.​
  4. Start the vacuum pump which withdraws all the air present in the jar.​
Observations:​
  1. When we connect bell to battery, we hear sound because air was present in the jar.​
  2. As the air from the jar is being evacuated, the sound keeps getting feeble. ​
  3. When no air is left in the jar, we observe no sound coming out of the jar.​
Conclusion:​
  1. Sound requires a medium for its propagation.​
  2. Sound cannot travel through vacuum.​

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