Aperson standing 1.20 m from a portable speaker hears its sound at an intensity of 5.50 ✕ 10−3 w/m2. hint (a) find the corresponding decibel level. db (b) find the sound intensity (in w/m2) at a distance of 36.0 m, assuming the sound propagates as a spherical wave. w/m2 (c) find the decibel level at a distance of 36.0 m. db

PART A)

L = 97.4 dB

PART B)

PART C)

L = 67.9 dB

Explanation:

PART A)

level of sound is given as

now we have

PART B)

Since source is a spherical source

so here the intensity of sound is inversely depends on the square of the distance from the source

PART C)

level of sound is given as

now we have

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