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A truck honking its 1000 Hz horn is traveling at 75 mph toward you. The speed...

A truck honking its 1000 Hz horn is traveling at 75 mph toward you. The speed of sound at that time was 1110 feet per second. What is the frequency you hear?

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Answer #1

Speed of sound, v = 1110 ft/s

Speed of the truck(also the speed of source), =75 mph = 110 ft/s

Since 1 mph = 1.466667 ft/s

Frequency of the source,

The source is approaching you therefore , by Doppler's effect frequency observed will be

The frequency that you hear will be higher than the original frequency of the source.

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