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
Correct Answer: D. There is no more material medium
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