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5 4) 81% Sura 11:24 AM Q E Firefox File Edit View History Bookmarks Tools Windo Help o o o MasteringPhysics: Hw 10 x C chegg study l Guided s x https a https://session. masteringphysics.com c a Search /myct Most visited Signed in as Juwan Mahaney Help close Physics 2750 Spring 2016 (University Physics I) Bookmarks HW 10 Exercise 16.21 previous l 8 of 14 l next Book ks Too. E Book ks Mer Exercise 16.21 v rted Book Part A myZou: Uni what is the difference between the sound intensity levels heard by the father and by the mother? P Sign in Mas A baby's mouth is a distance of 35 cm from her Bb Login Black father's ear and a distance of 1.60 m from her posted Express your answer using two significant figures. mother's ear. Netflix All-New Epi 3 Print Smart Log Cha V Pock Sig father Bmother Subm My Answers Give U Continue Provide Feedback de View All Assignments

Explanation / Answer

We know that the Intensity drops as the square of the distance from the source.

The distance ratio squared is (1.6/0.35)2 = 20.89 times greater at father's ear than mothers.

Let use the inverse square law. I1 = k(d1-2), I2 = k(d2-2).

Definition of Beta: B = 10logI

So B1-B2 = 10logI1/I - 10logI2/I = 10log(I1/I2) = 20log(d2/d1) = 20log(16/3.5), which is 13.2 dB.

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