Question

A 90-dB sound is absorbed by an eardrum 0.6 cm in diameter for 2hr. How much energy in joules does the eardrum absorb in that time?

Answer #1

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 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?

How much more intense is a sound of 70 dB than a sound of 20 dB
?

The decibel level of the noise from a jet aircraft is 130 dB
when measured 17.5 m from the aircraft.
(a) How much sound power does the jet aircraft emit?
W
(b) How much sound power would strike the eardrum of an airport
worker 17.5 m from the aircraft? (Use 1.9 ✕ 10-2 m as
the diameter of the ear.)
W

Problem 6: Two students are
standing the same distance from a source of sound. The first
student receives a power of 246 × 10-6 W in their
eardrum. The second student receives σ = 1.17 times more
power in their eardrum.
(A) If the second student's eardrum has a diameter of d
= 1 cm what was the intensity of the sound that the student heard,
in watts per square meter?
(B) In this problem take the speed of sound...

Assume that the opening of the ear canal has a diameter of 7.0
mm . For this problem, you can ignore any focusing of energy into
the opening by the pinna, the external folds of the ear. How much
sound power is "captured" by one ear at 0 dB, the threshold of
hearing? How much energy does one ear "capture" during 1 hour of
listening to a lecture delivered at a conversational volume of 60
dB ?

How much energy is stored in a 2.60-cm-diameter, 13.0-cm-long
solenoid that has 160 turns of wire and carries a current of 0.780
A ?

How much energy is stored in a solenoid 45.0 cm long, 9.0 cm
diameter having 800 turns when 22.0 A of current flows through
it?
A. 2.75 J
B. 3.95 J
C. 4.78 J
D. 5.48 J

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 10.0 kg wheel has a diameter of 50.0 cm. How much is the
moment of inertia of the wheel? If the wheel is pressed by an axe
with a normal force of 10.0 N, the coefficient of kinetic friction
between the axe and the wheel is 0.200. How much torque is the
wheel experiencing from the axe (in Nm)? If the wheel was spinning
with 300 rpm before the axe touches it, how long does it take for
the...

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