5. 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 ↑
Behind the bug…the
frequency ↓
9. Note: The change in
loudness is not the
Doppler Effect! It is
the shift in
frequency!
http://www.youtube.
com/watch?v=Y5Kae
CZ_AaY
10. Police use the Doppler
effect of radar waves
to measure the speeds
of cars on the highway
11. 2011, Aroldis Chapman
reached back and threw a
pitch to Andrew McCutchen
of the Pirates. The pitch
wound up being high and
tight, not a location
necessarily to be proud of,
and yet he received a
standing ovation.
Why the standing ovation,
you may ask? The stadium
radar reading displayed a
velocity of 106 MPH, a speed
that has only been topped
twice since baseball started
recording pitch velocities.
14. Named after Christian Doppler (Austrian)
1803-1853
15. When a source
moves toward you,
do you measure an
increase or
decrease in wave
speed?
Neither! It is the
frequency of a
wave that
undergoes a
change, not the
wave speed.
16. How does the
apparent
frequency of
waves change as a
wave source
moves?
The sound waves
become more
frequent
(compressed
together).
The sound waves
become less
frequent (stretched
apart).