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October 2, 2014

Homework Help: Physics

Posted by Armany on Tuesday, April 17, 2012 at 5:04pm.

At a factory, a noon whistle is sounding with a frequency of 480 Hz. As a car traveling at 85 km/h approaches the factory, the driver hears the whistle at frequency fi. After driving past the factory, the driver hears frequency ff. What is the change in frequency ff − fi heard by the driver? (Assume a temperature of 20 C.)

I tried this , but its wrong
[2(343)(22.22) / ((343) - (22.22))] (480)= 62.27 Hz

COuld someone help me out please.

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