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The walls of the building are rippled brick, where the depth of the ripples is 2 . 0 cm . You might have noticed that
The walls of the building are rippled brick,
where the depth of the ripples is cm You might have noticed that if you make noise near
the wall like clapping or shuffling your feet you will get a reflected pewpew sound.
That is because certain frequencies are reflected back with constructive interference: they
are amplified above the other frequencies making up the sound.
a Given the depth of the ripples, what is the difference
in path length for sound reflected off the top of the
ripple and sound reflected off the bottom of the rip
ple? Make a sketch to show this, assuming a path
that comes in perpendicular to the wall.
b What are some frequencies that will be amplified, as
described above?
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