An unidentified flying object (UFO) is producing a very loud single frequency tone at constant power. Its initial position relative to the stationary observer is <-4, 3> m. At this loca- tion, the decibel level at the observer is 116 dB. The object then moves at a constant speed to a final location <0, 3> m where the UFO stops moving again.
(a) During this motion, did the frequency the observer hear increase, decrease, or stay the same? Explain.
(b) When the unidentified object is at the final location, what is the decibel level heard at the observer's location?
