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The sound from a bell in an enclosed jar gradually faints away while the jar...

Physics
WAEC 1991
The sound from a bell in an enclosed jar gradually faints away while the jar is being evacuated. Which of the following explains this observation?
  • A. the pressue is reduced
  • B. the sound waves are pumped out
  • C. the waves are absorbed in the inner walls
  • D. There is no more material medium
  • E. the air is disturbed
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Correct Answer: Option D
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