A. the pressure 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
Correct Answer:
Option D – There is no more material medium
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![A cannon is fired from town X; after how long is the sound heard at a town Y 4.95km away? [velocity of sound in the air = 330 ms−¹1]](https://erudites.ng/wp-content/plugins/contextual-related-posts/default.png "A cannon is fired from town X; after how long is the sound heard at a town Y 4.95km away? [velocity of sound in the air = 330 ms−¹1]")
