For an outdoor rock concert we want the sound intensity at a distance 20m from the speaker to be 1w/m2. assuming that the sound waves have the same intensity in all directions, what acoustic power is needed from the speaker array? assume that the acoustic power is spread uniformly over a hemisphere (none is directed into the ground). (note: the electrical power would need to be a lot higher because speakers are typically only ~1% efficient)
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For an outdoor rock concert we want the sound intensity at a distance 20m from the speaker to be 1w/...
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