22
Doppler
effect examples
•Car with horn blowing, moving away from you
at 70 MPH.
–Speed of sound is ~700 MPH = 1000 ft/sec
–Original horn pitch is 200 cycles/sec Þ lo ~
5 ft
•Star moving toward you at 200 km/sec = 2.0´105 m/s
–Speed of light c = 3.00 ´ 108 m/s
–Original Ha
lo= 0.65647 mm
