Question

Review | Constants Periodic Table From a distance of 4.0 m, a bystander listens to a jackhammer breaking concrete. Part A .. MasteringPhysics: HW 6 (Partial) session.masteringphysics.com/myct/itemView?... How far would he need to move from the jackhammer so that its perceived loudness decreases by a factor of 2? Express your answer with the appropriate units. Submitted Answers ANSWER 1: == 1.7 m r = 5.65 m Submit Previous Answers Request Answer ANSWER 2: r = 3.33 m X Incorrect; Try Again; 3 attempts remaining ANSWER 3: T= 1.7 m rovide Feedback Next > Return to Current Item Pearson

Answer 1

Part A )

given

r₁ = 4 m

I₂ = I₁/2

r₂ = ?

using relation I $\alpha$ ( 1/r² )

I₁ / I₂ = ( r₂ / r₁ )²

I₁/ (I₁/2 ) = ( r₂ / 4)²

1/0.5 = r₂² / 16

2 = r₂² / 16

r₂ = 5.6568 m

Option " Answer 1 " is r = 5.6568 m is correct.