Question

What is the power of a sound wave (β = 32 dB) passing through an area of 12.5 cm2? Suppose the same sound wave passes through an area of 25 cm2. What is its intensity level?

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 light wave and a sound wave passes through identical single
slit. (a) Compare the diffraction pattern. What happens in passing
through the opening and subsequently that produces the pattern. (b)
What happens to the pattern of the light waves if the single slit
is replaced by a double slit.

An electronic point source emits sound isotropically at a
frequency of 3 × 103 Hz and a power of 34 watts. A small microphone
has an area of 0.72 cm2 and is located 198 meters from the point
source.
1)
What is the sound intensity at the microphone ?
I =
2) What is the power intercepted by the microphone?
Pin =
3) How many minutes will it take for the microphone to recieve
0.2 Joules from this sound?
ΔT...

An electronic point source emits sound isotropically
at a frequency of 2 × 103 Hz and a power of 29 watts. A
small microphone has an area of 0.72 cm2 and is located
150 meters from the point source.
1)
What is the sound intensity at the microphone ?
I =
2)
What is the power intercepted by the microphone?
Pin =
3)
How many minutes will it take for the microphone to recieve 0.2
Joules from this sound?
ΔT...

An electronic point source emits sound isotropically at a
frequency of 3 × 103 Hz and a power of 27 watts. A small
microphone has an area of 0.78 cm2 and is located 184
meters from the point source.
1)
What is the sound intensity at the microphone ?
I =
2)
What is the power intercepted by the microphone?
Pin =
3)
How many minutes will it take for the microphone to recieve 0.2
Joules from this sound?
ΔT...

The sound level produced by one singer is 73.7 dB. What would be
the sound level produced by a chorus of 36 such singers (all
singing at the same intensity at approximately the same distance as
the original singer)? Answer in units of dB.

The sound level produced by one singer is 83.7 dB.
What would be the sound level produced by a chorus of 39 such
singers (all singing at the same intensity at approximately the
same distance as the original singer)?
Answer in units of dB.

What reference pressure would be required for a 0
dB sound to represent "true" silence ?
The frequencies at which the vocal tract "filter"
permits maximum energy transfer are called ? They will appear on a
wide band spectrogram as ?
The Intensity Level (IL) of a sound having a value
of 1 x 10-15 W/cm2 is ____ dB relative to the standard
reference.
A sound reaching a sound level meter is 0.0001
dynes/cm2. The Sound Pressure Level (SPL) of...

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...

If the sound power level at a concert is averaging about 103 dB
when measured at 12 m from the stage, what would the average
decibel level be when measured 32 m from the stage?
A. 0.375 dB
B. -8.52 dB
C. 94.5 dB
D. -94.5 dB

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