Question:
When i hit in wall. then how can wall vibrate. So nothing is vibrate but sound is produce
Answer:
If you hit something hard, it can transfer all of that energy back in a single, sharp sound. Hit a wall, and you hear it as a crack: some energy is absorbed by the bricks (heating them up), while the rest is given back quickly as a sharp sound. (Also, the sound of your finger bones breaking.)
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