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The low-frequency speaker of a stereo set has a surface area of 0.05 m2 and prod

ID: 1383826 • Letter: T

Question

The low-frequency speaker of a stereo set has a surface area of
0.05 m2 and produces 1W of acoustical power. What is the intensity at
the speaker? If the speaker projects sound uniformly in all directions, at
what distance from the speaker is the intensity 0.1 W/m2 ? The low-frequency speaker of a stereo set has a surface area of
0.05 m2 and produces 1W of acoustical power. What is the intensity at
the speaker? If the speaker projects sound uniformly in all directions, at
what distance from the speaker is the intensity 0.1 W/m2 ?

Explanation / Answer

Solution:

a) Intensity I=P/A = (1W)/(0.05m2) = 20W/m2

b) r= (P/4(pi)I)0.5

= (1/4*3.14*0.1)0.5

= 0.8922m

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