16.1 Ch. 7.8-9 Work, Energy, and Power in Humans; World Energy Use Please show w

Question

16.1 Ch. 7.8-9 Work, Energy, and Power in Humans; World Energy Use

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Calculate the minimum safe distance you can be from a speaker that puts out 2.00 W of sound, using the following assumptions: The sound power spreads uniformly over a sphere of radius rand area 4 pi^2, your eardrum area is 0.780 cm^2, and it cannot tolerate more than 1.00 Times 10^-6 W. Damage is done by this small amount of power after prolonged exposure and can be repaired by the body, but damage done by 10^-4 W (found at many rock concerts) occurs almost instantaneously and prolonged exposure at that level produces permanent damage. 2.00 W of sound power is very large compared to what the ear can tolerate. Suppose that 100 W of electrical power input (a typical value for many sound systems) is applied to this speaker. What is the efficiency of this speaker in converting electrical power to sound?

Explanation / Answer

safe distance=SQRT(1/(4x3.14x2.00)

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