The Doppler Effect
Named
after Christian
Doppler (Austrian)
1803-1853
The Doppler Effect
Imagine a bug
jiggling its legs
and bobbing up
and down in the
middle of a
quiet puddle
Doppler Effect
What would
happen to the
waves if the bug
began to swim
forward, toward
B?
.What does that do to
the frequency of the
waves, in front of the
bug and behind the
bug?
In front of the bug…the
frequency increases
Behind the bug…the
frequency decreases.
If the frequency of sound
changes…what also changes?
Pitch….
A man’s vocal
chords vibrate slower than a
woman’s…hence a lower
voice=lower pitch
What is The Doppler Effect?- define…
The Doppler effect can be described
as the effect produced by a moving
source of waves in which there is an
apparent upward shift in frequency
for observers
The Doppler Effect and
RADAR
Police use the
Doppler effect of
radar waves to
measure the
speeds of cars on
the highway
What is red shift and blue shift?
Redshift and blueshift describe the
change in the frequency of a light wave
depending on whether an object is
moving towards or away from us.
When an object is moving away from us,
the light from the object is known as
redshift,
and when an object is moving towards
us, the light from the object is known as
blueshift.
https://www.youtube.com
/watch?v=7l1OxhxCh1E
https://www.youtube.com
/watch?v=h4OnBYrbCjY
https://www.youtube.com
/watch?v=yeBwzmMi9M0
Upload the notes