ASTR 1050

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

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•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

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