r - pdx.edu · The Doppler Effect\r. Case 1: Observer in motion\r Source and medium at rest\r. l\r....

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Transcript of r - pdx.edu · The Doppler Effect\r. Case 1: Observer in motion\r Source and medium at rest\r. l\r....

Page 1: r - pdx.edu · The Doppler Effect\r. Case 1: Observer in motion\r Source and medium at rest\r. l\r. f. Observer in motion\r. Stationary source\r. vobs\r
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The Doppler Effect
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EXAMPLE: A rocket moves at a speed of 242 m/s directly towards a stationary pole (through stationary air) while emitting sound waves at frequency f = 1250 Hz. a) What is the frequency f' measured by a detector that is attached to the pole? b) Some of the sound reaching the pole reflects back to the rocket as an echo. What frequency f” does a detector on the rocket detects for the echo?
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