Class 9 Physics Sound Sound cannot propagate through vacuum

Sound cannot propagate through vacuum

Sound cannot propagate through vacuum. Here is an experiment to prove this.

  • Take an airtight glass bell jar and an electric bell.
  • Connect a vacuum pump to the bell jar.
  • Suspend the bell inside the jar as shown
  • Now ring the bell. The bell sound will be heard very clearly.
  • Gradually start pumping out the air from the jar. Simultaneously, also ring the bell. The bell sound becomes feebler and feebler as the air is pumped out.
  • When the air is completely pumped out, the sound will not be heard at all.
  • This proves that sound does not travel through vacuum.

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