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Doppler's Effect with wind blowing

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A factory whistle emits sound of frequency 645 Hz. On a day when the wind velocity is 9 m/s from the north, what frequency will be heard be observes who are located, at rest?

a) Due north of the whistle?
b) due south of the whistle?
c) due east of the whistle?
d) due west of the whistle?

ii) What frequency is heard by a cyclist traveling at 13 m/s towards the whistle and heading

a) north?
b) West?

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