Answer:
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Energy Conservation Theory,




<h3>What is law of energy conservation?</h3>
The principle of energy conservation states that energy is neither created nor destroyed. It may change from one sort to another. Just like the mass conservation rule, the legitimacy of the preservation of energy depends on experimental perceptions; hence, it is an experimental law. The law of preservation of energy, too known as the primary law of thermodynamics
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Cocking your head would be most useful for detecting the LOCATION of a sound.
P=IV, where P is power, I is resistance, and V is voltage. Plug in and solve:
P=400(20)
P=8000W
Hope this helps!!
Because the sound waves are being observed by the people that are there and it is not empty as in an empty place the sound waves will come back to you.