Question

**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 to be 349 m/s. How fast, in meters per second, does an observer need to approach a stationary sound source in order to observe a 4.5 % increase in the emitted frequency?

Answer #1

A sound wave strikes a student’s eardrum with a power of 22 μW.
The sound’s intensity at the eardrum is 0.95 W/m2.
Assuming a circular eardrum, what is the radius of the student’s
eardrum, in millimeters?
The same sound wave delivers the same power to the eardrum of a
second student. His eardrum has a 14 % larger radius than that of
the first student. What is the intensity of the sound, in watts per
square meter, at the second...

(1) Suppose an oncoming ambulance moving at 115 km/h emits a
steady 810-Hz sound from its siren.
Part (a) What frequency, in Hz, is received by
a person watching the oncoming ambulance? The speed of sound on
this day is 345 m/s.
Part (b) What frequency, in Hz, does she
observe after the ambulance has passed?
(2). In this problem take the speed of sound to be 349 m/s.
How fast, in meters per second, does an observer need to...

1. The loudness level of a? sound, D, in?
decibels, is given by the formula D=10log(10^12I), where I is the
intensity of the? sound, in watts per
meter^2. Decibel levels range from? 0, a barely audible? sound,
to? 160, a sound resulting in a ruptured eardrum. The sound of a
certain animal can be heard 500 miles? away, reaching an intensity
of 6.96.9t×(10^5) watts per meter^2. Determine the decibel level of
this sound. At close? range, can the sound of...

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