Answers

2015-06-16T20:39:15+05:30
This happens because the mug contains air in it .
in short we can say this happened due to air pressure.
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2015-06-16T22:32:47+05:30
When, a mug is immersed in water, the particles of water sets into vibration and sound is propagated by vibrating bodies.
The bubbles are formes due to the air present in it.
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