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Q. A 0.640-m long gas column is open at one end and closed at the other. What is the fundamental resonant frequency of the air column if the speed of sound in the air is 340 m/s?

Q. Standing at a crosswalk, you hear a frequency of 510 Hz from the siren of an approaching ambulance. After the ambulance passes, the observed frequency of the siren is 436 Hz. Determine the ambulance's speed from these observations. (Take the speed of sound to be 343 m/s.)

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