Part A Express your answer as an integer. Express your answer with the appropria
ID: 2243673 • Letter: P
Question
Part A Express your answer as an integer. Express your answer with the appropriate units. SIL_2 = ? SIL_2 = ? Part B Express your answer as an integer. Express your answer with the appropriate units. Delta SIL = ? Having grown tired of hearing loud music from passing cars at 3 am and the boisterous yelling of bar patrons at closing, a professor buys a new home in a quiet neighborhood. She is, however, concerned about noise from freeway traffic. Using a sound intensity level meter,she stands at an overpass 13m above the passing cars and measures a maximum intensity level of 85dB. If her new home is 2.9km from the freeway, what's the intensity level there? Assume no decrease due to absorption by air, trees, or other objects. Express your answer as an integer. Express your answer with the appropriate units. SIL_2 = ? Compare your result with a quiet whisper, 20 dB. Express your answer as an integer. Express your answer with the appropriate units. Delta SIL = ?Explanation / Answer
as intensity varies inversely with square of distance,
let intensity at 13 m distance is I1 and at 2.9km is I2.
then if dB value at 2.9km is B,
then 85-B=10*log(I1/I2)
85-B=10*log((2900/13)^2)
B=38.03 dB
part B:
delta SIL=18.03 dB