ooo AT&T; 11:19 PM 59% D usi38ok.theexpertta.com C Chapter 17 Begin Date: 4/10/2

Question

ooo AT&T; 11:19 PM 59% D usi38ok.theexpertta.com C Chapter 17 Begin Date: 4/10/2017 12:00:00 AM Due Date: 4/19/2017 11:00:00 PM End Date: 4/19/2017 11:00:00 PM Problem A student perceives a sound with a power ofP AW Altheir the source,the sound has 50% Part (a) Assuming the eardrum is circular, what is the radius of the eardrum in m? 50% Part (b) Another student stands in the exact same location, but receives 20% more power from the source. What is the radius of the second student's eardrums? ODegrees ORadans All content c 2017 Expert TA. LLC

Explanation / Answer

here,

P = 31 uW = 31 * 10^-6 W

I = 0.62 W/m^2

a)

let the radius fo the eardrum be r1

I = P * pi * r^2

0.62 = 31 * 10^-6 pi * r1^2

r1 = 7.98 * 10^1 m

b)

when P' = 1.2 * P

let the radius fo the eardrum be r2

I = P' * pi * r2^2

0.62 = 31 * 1.2 * 10^-6 pi * r1^2

r2 = 7.28 * 10^1 m

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