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DOPPLER EFFECT
DOPPLER EFFECT
ScnMaster
the
shift
in
frequency
of
acoustic
or
electromagnetic
radiation
emitted by a
source
moving
relative
to an
observer
a s perceived by the
observer
: the
shift
is to higher frequencies when the
source
approaches and to lower frequencies when it recedes. For
example
, when one hears the
sound
of the
siren
on a
police
car, the
pitch
is perceived to be going higher as the car approaches and going lower as the car recedes. Named after C.J. Doppler (1803 - 53), Austrian
physicist
.
—
Handbook
for
Preclears
Glossary (app 9.7.90)