You are sitting near the back of a twin-engine commercial jet airliner,which has the engines mounted on the fuselage near the tail.The nominal rotation speed for the turbofan in each engine is 5200 revolutions per minute,which is also the frequency of the dominant sound emitted by the engine.If one engine is running at 5214 revolutions per minute and the other at 5385 revolutions per minute,the passengers hear a pulsing noise that repeats every

Question

Quizplus · Accepted Answer

To find the time interval between pulses, we need to calculate the difference between the frequencies of the two engines:
5385 - 5214 = 171 revolutions per minute
To convert this to cycles per second, we divide by 60:
171/60 = 2.85 Hz
Next, we need to find the time between each pulse, which is the inverse of the frequency:
1/2.85 = 0.35 seconds
Therefore, the answer is (B).

You Are Sitting near the Back of a Twin-Engine Commercial