Atruck horn emits a sound with a frequency of 238 hz. the truck is moving on a straight road with a constant speed. if a person standing on the side of the road hears the horn at a frequency of 220 hz, then what is the speed of the truck? use 340 m/s for the speed of the sound.

Explanation:

If the person hearing the sound is at rest, then the equation for the frequency heard given the emitted frequency , the speed of the truck and the speed of sound will be:

Where will be positive if the truck is moving away from the person, and negative otherwise. We then do:

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