What is the power output of the speaker?

label Physics
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Apr 7th, 2015

130 = 10*log(I/I0) = 10*[log(I) + 12] 

13 = log(I) + 12 

log(I) = 1, I = 10 W/m² 

 covering an area is hemispherical so of 2*π*(1.3^2), so the total power is 10*2*π*(1.3^2) W. 

106.2 W 

85 dB = 10*[log(I) + 12] 

log(I) = -3.5

I = 10^-3.5 W/m² 

The distance is such that the area covered by 106.2 W yields 10^-3.5 W/m²: 

106.2/(2*π*r²) = 10^-3.5

r^2= 53449.62

r=231 m

Apr 6th, 2015

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Apr 7th, 2015
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Apr 7th, 2015
Sep 23rd, 2017
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