Question

Two
sound waves arrive to an observer, the first is loud at 2 W/m ^2
and the second one is quieter at 100 mW/m^2 ; how many dB louder is
the first one compared to the second one?

Answer #1

One of the loudest sounds ever recorded was of a Saturn V rocket
launch. The sound energy output of the rocket launch was 252 MJ
every second.
a) What is the sound level (in dB) 100 m away from the
launch?
Air absorbs about 7.0 dB/km as it moves through air
b) Correcting for absorption, find the sound level at a distance
of 1 km from the launch
c) Correcting for absorption, find the sound level at a distance
of...

Playing with sound is one way to alleviate boredom on my
spacecraft. I found a dB meter and started measuring how loud they
were. (a) I found two deafening pings that differed in loudness by
4.2 dB. What the ratio of the intensity of the louder sound to that
of the softer one? (b) If one sound is 100 times as intense as
another, by how much do they differ in sound intensity level (in
decibels)?

An observer experiences a sound wave intensity
9.00×10-5 W⋅m−2W⋅m−2 at a distance 5.22 m from a source
which emits wave in all direction. What is power of the source?

Two loudspeakers, 1.4 m apart, emit sound waves with the same
frequency along the positive x-axis. Victor, standing on
the axis to the right of the speakers, hears no sound. As the
frequency is slowly tripled, Victor hears the sound go through the
sequence loud-soft-loud-soft-loud before becoming quiet again.
What was the original sound frequency? Assume room temperature
of 20∘C.

Two loudspeakers emit 500 Hz sound waves with an amplitude of
1cm.
Speaker 2 is 1.00m behind speaker 1, and the phase difference
between the
speakers is 90 degree
. (I) What is the phase difference of the sound wave at a
point 2.00 m in front of speaker 1? (II) What is the minimum
distance
between the two speakers such that the observer at this position
hears
the minimal sound? (6 points)

You are trying to decide between two new stereo amplifiers. One
is rated at 110 W per channel and the other is rated at 200 W per
channel. In terms of dB, how much louder will the more powerful
amplifier be when both are producing sound at their maximum
levels?

Two separate, coherent lasers generate waves whose wavelengths
are 0.1m. The two waves travel and arrive at a particular point. If
one wave travels 1 m and the other travels 2 m, what type of
interference pattern occurs at this point? Give some examples of
your answer in your daily life.
Two separate, coherent lasers generate waves whose wavelengths
are 1 m. The two waves travel and arrive at a particular point. If
one wave travels 2 m and the...

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...

Two stereo speakers mounted 4.52 m apart on a wall emit
identical sound waves. You are standing at the opposite wall of the
room at a point directly between the two speakers. You walk 2.11 m
parallel to the wall to a location where you first notice that the
sound intensity is much less. If the wall along which you are
walking is 13.3 m from the wall with the speakers, what is the
wavelength of the sound waves? (Answer:...

Two identical loudspeakers 2.20 m apart are emitting sound waves
into a room where the speed of sound is 340 m/s. Abby is standing
4.00 m in front of one of the speakers, perpendicular to the line
joining the speakers, and hears a maximum in the intensity of the
sound.
What is the lowest possible frequency of sound for which this is
possible?

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