Posted by **Intensity** on Monday, January 25, 2010 at 8:43pm.

While blowing its horn of frequency 580 Hz, a car accelerates at 0.4 m/s2.

The car starts from rest by your side and moves away.

How long will it take for the frequency you hear to decrease by 5%?

Hint: Do not forget to include the time it will take for sound to reach you.

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