Part A (I got this part): The decibel level of the noise from a jet aircraft...
Homework Answers
Power you got = 76666.17 W
Intensity = P/4*pi*R^2
I = 76666.17/4*3.14*24.7^2
I = 10.005 W/m2
(b)
Sound power striking worker eardrum is
P = I∙A
= 10.005W/m² ∙ 1.7×10⁻²m²
= 0.17W
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Part A (I got this part): The decibel level of the noise from a jet
aircraft...
The decibel level of the noise from a jet aircraft is 130 dB when measured 24.8...
The decibel level of the noise from a jet aircraft is 130 dB when measured 24.8 m from the aircraft. How much sound power does the jet aircraft emit? Answer in units of W. How much sound power would strike the eardrum of an airport worker 24.8 m from the aircraft? Assume the diameter of the worker’s eardrum is 1.7 × 10−2 m. Answer in units of W.
An opera singer produces a decibel level of 109 dB at a distance of 0.400 m.The...
An opera singer produces a decibel level of 109 dB at a distance
of 0.400 m.The area of a typical eardrum is about 5.00 ✕
10−5 m2.mAssume the sound propagates as a
spherical wave. Determine the sound intensity I and power P
incident on a typical eardrum at distances of 3.00 m and 21.0 m
from the singer.
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At your house, you hear the busy freeway (the dB level of a freeway is 80...
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An opera singer produces a decibel level of 109 dB at a distance
of 0.400 m.The area of a typical eardrum is about 5.00 ✕
10−5 m2.mAssume the sound propagates as a
spherical wave. Determine the sound intensity I and power P
incident on a typical eardrum at distances of 3.00 m and 21.0 m
from the singer.
ADDITIONAL PROBLEMS An opera singer produces a decibel level of 109 dB at a distance of 0.400 m. The area of a...
. At your apartment, you hear the busy road (the dB level of a freeway is 80 dB from 1.00 m away) and measure the noise at a constant level of 45 dB. a) What is the power output of traffic on the road? b) How far away is your house from the road? c) How far from the road would you need to be for the sound to measure at 20 dB? d) Town Hall is planning to add...
2. (2 pts) A sound level of 150 dB is measured at 2 meters from a jet engine. Find the sound intensity B of the jet engine at a distance of 20 meters assuming intensity falls off as 1/2. (Hint: First find intensity at 150 dB sound level.) 150dB 150d. B = 10Log G-1z) = 1000 W/m2 B (dB) = 2 m. B = I=100x701450) - 1000 W/m2 1000 11/12 = 'rz 2009 10-12
9. Sound levels are measured by the logarithmic decibel scale, named after Alexander Graham Bell. The sound level, L, corresponding to an intensity of I, in watts per square metre, is し= 10 log-, where lo is the minimum intensity audible to the human ear. If amplified rock music has a loudness of 120 dB and ordinary conversation has a loudness of 50 dB, how many times louder than ordinary conversation is amplified rock music?
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