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