1. Imagine a military fighter jet pursuing another another airplane. Both airpla

Question

1. Imagine a military fighter jet pursuing another another airplane. Both airplanes move along the x-axis in the same direction. The speed of the fighter jet makes a loud noise at a speed of sound at their altitude is 300m/s. The engine of the fighter jet makes a loud noise at a frequecy of 2000Hz. What is the frequency of that noise heard by the pilot of the other airplane.

2. Two identical loud speakers emit sinusoidal spherical sound waves in phase at a frequency of 170Hz. The speed of sound is 340m/s. The speakers are placed along one wall of a square 10m*10m room. They are centered and separated by 8m. A student walks along the wall pposite the speakers, carefully monitoring the loudness of sound. How many nodes (minima of sound intensity) and antinodes (maxima of sound intensity) will the student encounter walking over the entire length of that wall?

Explanation / Answer

the frequency of that noise heard by the pilot of the other airplane is

n' = [(V + Vo) / V] n

= [(340 + 300) / 340] (2000)

= 3764 Hz

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