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Physics
Sound
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Cards (9)
Compression
is a region where the
air particles
are
closer
together, resulting in
air pressure
higher
than normal
atmospheric pressure.
Rarefaction
is a region where the
air particles
are
further apart
, resulting in
air pressure
lower
than normal
atmospheric pressure.
Loudness
relates to
amplitude.
Pitch
relates to
frequency.
audible
and inaudible sound:
infrasound
:
0-20Hz
human
:
20-20000Hz
dogs
:
20-100000Hz
ultrasound: 20000-1000000+Hz
Reflection
of sound is called an
echo.
Sonar
(sound, navigation and ranging)
technology
,
imaging internal organs
and
breaking up kidney stones
and
cancer treatment
are all under
ultrasound.
Sound waves
are a
longitudinal wave
which needs a
medium
to
propagate
Sound waves
can measure the
depth
of
sea floor
, find
fishes
,
medical imagine
and
breaking up kidney stones
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