Doppler Effect.pdf
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1. A physics professor claims the red light from a traffic light was Doppler shifted to green due to his motion. 2. Using the Doppler effect formula, his speed was calculated to be approximately 50 mph. 3. Resolving the Doppler effect equations shows the professor was traveling at 119,010,000 m/s or about 50 mph.
Doppler Effect.pdf
- 1. 1 A physics professor claims in court that the reason he went through the red light (¦Ë = 650 nm) was that, due to his motion, the red color was Doppler shifted to green (¦Ë = 550 nm). How fast was he going?
- 3. 3
- 5. 5 0 0 0 Doppler Effect 1 1 u c u f c u f c f f u c u f c u f c + + + = ? = ? = ? ? ?
- 6. 6 2 2 2 0 2 2 2 0 ( ) 1 1 (650 ) (550 ) ( ) 1 1 c u u nm c u c c c u u nm c u c c ? ? ? ? + + + ? = ? = ? = ? ? ?
- 7. 7 422500 1.3967 302500 1.3967(300000000 ) 300000000 c u c u c u c u m m u u s s + + ? = ? = ? ? ? ? = +
- 8. 8 419010000 1.3967 300000000 (419010000 300000000) (1 1.3967) m m u u s s m u s ? ? = + ? ? = +
- 9. 9 7 119010000 2.3967 49655776.69 5 10 m u s m m u X s s ? = ? = ?