Doppler Effect. Doppler Shift (p272)If there is relative motion between the source of a wave and the receiver of the wave the frequency received will.

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Presentation transcript:

Doppler Effect

Doppler Shift (p272)If there is relative motion between the source of a wave and the receiver of the wave the frequency received will be different from the frequency of the source Here the sound (yellow object) and observer are stationary, relative to each other

(p 272) If the source is moving away from the receiver the frequency received will be less (lower) than the source: the wavelength “appears” to increase so frequency appears to decrease Motion of source (yellow object)

If the source is moving toward the receiver the frequency received will be higher than the source: the wavelength “appears” to decrease so frequency appears to increase Motion of source (yellow object)

(p 272) This is know as the Doppler shift Radar guns used by the police use the Doppler shift to measure the speed of your car

(add to p 272) Which has or is the (explain): d.d. f.. c a.a. b.b. e.e.

a.highest pitch (pitch = frequency): b.most quiet c.Loudest d.Lowest pitch e.Same sound as the source f.Same pitch as the source

a.highest pitch (pitch = frequency): “b” as it has the largest velocity toward the source b.most quiet: “b” first, then “f” as it is farthest c.Loudest: “a” nearest d.Lowest pitch: “e” as it has the largest velocity away form source e.Same sound as the source: “a” as it si closest to the source and not moving f.Same pitch as the source: “a” and “d” as neither are moving