Question

13. (13 points) At a local airport the maximum allowable sound intensity level is 98.5 dB as measured by a microphone at the end of the 1740-m-long runway. A certain airliner produces a sound intensity level of 105.0 dB on the ground when it flies over at an altitude of 100 m. On takeoff, this airliner first accelerates for 1200 m along the runway to reach lift-off speed before leaving the ground, at which point it climbs at a 15° angle. Take the speed of sound to be 343 m/s. Dthe ro an ns d b) Does this plane climbing at the given angle violate the sound ordinance? lc) At whaf critical minimum angle must the plane climb so that it does just barely avoid violating the sound ordinance?

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Answer 1