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What is Sound power level?

Decibel level of power calculated using the standard reference value of 10-12 watts.
Do the sound waves travel through all media?
Yes. Speed of sound varies with the material through which it travels. Broadly, in gases the sound speed is about 330 metres per second whereas in liquids and solids it is 1.5 km and 5.0 km per second respectively.

What is echo?
This question should be answered here.

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