L 23 – Vibrations and Waves . resonance clocks – pendulum springs harmonic motion mechanical waves sound waves golden rule for waves musical instruments The Doppler effect Doppler radar radar guns. updated 10/23/07. Review.
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snapshot of the
string at some
Twatching the waves go by
sit at some x and watch
5 second rule
for thunder and lightening
Waves add to double amplitude
waves add to give 0 amplitude
Red + Blue
Take one wave, turn it upside down (invert
its phase) then add it to the original wave
a higher frequency (pitch) sound.
When radar waves bounce off a moving object
(echo )the frequency of the reflected radar changes
by an amount that depends on how fast the object
is moving. The detector senses the frequency
shift and translates this into a speed.