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Show your process •A truck moving at 40 m/s is followed by a cop moving at...

Show your process

•A truck moving at 40 m/s is followed by a cop moving at 30 m/s. The cop uses ultrasound at a frequency of 25 kHz to monitor the speed of the truck.

(actually, radar or laser light is used…but the idea is the same)

a) What frequency ultrasound is observed by the truck?

b) The sound is reflected off of the truck and travels back to the cop. What frequency does the cop observe?

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Answer #1

Doppler effect in sound

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