Question

a 7
hr exposure to a sound intensity level of 90.0 dB may cause hearing
damage. what energy in joules falls on a .450 cm dismeter eardrum
so exposed?

Answer #1

The sound intensity level of 0 dB is defined as the threshold
for hearing value of I0 = 10-12 W/m2.
a) What is the sound intensity (in W.m-2) for a sound level of 46
dB?
b) The intensity of sound emitted from a point source decreases
with the square of the distance according I2 = I1.(d1/d2)2. Given
that the sound level intensity of 46 dB is obtained at a point d1 =
6.8 cm from a source, at what distance...

A person wears a hearing aid that uniformly increases the
intensity level of all audible frequencies of sound by 26.8 dB. The
hearing aid picks up sound having a frequency of 250 Hz at an
intensity of 2.40 ✕ 10−11 W/m2. What is the intensity delivered to
the eardrum?

2. From a vantage point very close to the track at a stock car
race, you hear the sound emitted by a moving car. You detect a
frequency that is 0.852 times smaller than that emitted by the car
when it is stationary. The speed of sound is 343 m/s. What is the
speed of the car?
3.Hearing damage may occur when a person is exposed to a sound
intensity level of 90.0 dB (relative to the threshold of human...

A 60-dB sound wave strikes an eardrum whose area is 5.0×10?5m2.
The intensity of the reference level required to determine the
sound level is 1.0×10?12W/m2. 1yr=3.156×107s. How much energy is
absorbed by the eardrum per second?At this rate, how long would it
take the eardrum to receive a total energy of 1.0 J?

You are in a music show. You’re hearing loud music with a sound
intensity level of 100 (dB) when standing 4 (m) away from the
stage.
How far should you stand from the stage if you want to listen to
music with a comfortable sound intensity level of 70 (dB)?

A person standing a certain distance from fifteen identical
loudspeakers is hearing a sound level intensity of 112 dB. What
sound level intensity would this person hear if three are turned
off?

A person standing a certain distance from eighteen identical
loudspeakers is hearing a sound level intensity of 118 dB. What
sound level intensity would this person hear if seven are turned
off?

A 59-dB sound wave strikes an eardrum whose area is 5.0×10?5m2.
The intensity of the reference level required to determine the
sound level is 1.0×10?12W/m2. 1yr=3.156×107s.
a) How much energy is absorbed by the eardrum per second?
b) At this rate, how long would it take the eardrum to receive a
total energy of 1.0 J?

A 58-dB sound wave strikes an eardrum whose area is 5.0×10−5m2.
The intensity of the reference level required to determine the
sound level is 1.0×10−12W/m2. 1yr=3.156×107s.
Part A: How much energy is absorbed by the eardrum per
second?
Part B: At this rate, how long would it take the eardrum to
receive a total energy of 1.0 J?

The sound intensity 30 meters from a jet engine is 10 Watts per
square meter.
What is the sound intensity level, in decibels, at the
specified location
a = 10 log [ I / IO ]
IO = 10-12
W/m2
I = 10 Watts
a = 130 dB
B. Without hearing protection, repeated exposure to sounds at or
above 80 decibels can cause hearing loss. What minimum distance
from the source (the jet engine) would a listener have to keep...

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