# Please answer both parts will upvote immediatly A truck moving at 20 m/s passes a police...

###### Question:

A truck moving at 20 m/s passes a police car moving at 47 m/s in the opposite direction. If the frequency of the siren relative to the police car is 672 Hz, what is the frequency heard by an observer in the truck as the police car approaches the truck? Please give your answer in Hz. Question 6 5 pts An organ pipe open at both ends has a radius of 5.2 cm and a length of 5.6 m. What is the frequency of the third harmonic? Please give your answer in Hz.

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