2 .- When a propelled airplane takes off, it produces a sound with intensity of

Question

2 .- When a propelled airplane takes off, it produces a sound with intensity of 9 W / m2 to 33 m of distance. You prefer the quiet sound of the normal conversation, which is 1 uw / m2. Suppose That the aircraft behaves as a point source of sound (a sphere). A). What is the distance Minimum to the runway to which you could live to preserve your state of peace Mental, b) What intensity of the sound of the planes experiences a friend of his, who lives to a Distance from the airstrip that is double the distance you live? 2 .- When a propelled airplane takes off, it produces a sound with intensity of 9 W / m2 to 33 m of distance. You prefer the quiet sound of the normal conversation, which is 1 uw / m2. Suppose That the aircraft behaves as a point source of sound (a sphere). A). What is the distance Minimum to the runway to which you could live to preserve your state of peace Mental, b) What intensity of the sound of the planes experiences a friend of his, who lives to a Distance from the airstrip that is double the distance you live?

Explanation / Answer

here

Since intensity of sound generated is inversely propotional to distance therefore :

I1/I2 = (r2/r1)^2

where,
I1 intensity of source
r1 is distance to source 1

i2 intensity for source 2
r2 is distance for source 2

Part a:
distance to my place, r2 = r1 * sqrt(i1/i2)
distance to my place, r2 = 33 * sqrt( 9/(1*10^-6) )
distance to my place, r2 = 99000 m

part B:
r2 = 99000 * 2 = 18000 m

therefore
intensity for friend , i2 = I1 / (r2/r1)^2
intensity for friend , i2 = 9 /(18000/33)^2
intensity for friend , i2 = 3.025*10^-5 w/m^2

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