Two speakers 5 m apart, are driven in phase by the same amplifier, at a frequency...

Two speakers 5 m apart, are driven in phase by the same amplifier, at a frequency of 775 Hz. The speed of sound is 340 m/s. An observer starts 5m away from one of the speakers at a point along the perpendicular to the line connecting the two speakers, and moves away from the speakers along that line.

a) How much distance separates the second and the third interference minima they hear?

b) Do you expect the intensity at the sound minimum to be zero?

c) One of the speakers is now turned off, 15 W of power are measured going through an opening that is 3mm in diameter, 2.1 m away from the other speaker, what is sound level 3 m away from that speaker.

d) A 120 students in a classroom produce a sound level of 60 dB, what sound level will 90 students produce?

e) You are diving at 20m/s behind a truck moving at 15 m/s, you are both heading south. The truck engine emits a strange noise at 390 Hz, what frequency do you hear if the wind is blowing due north at 30 m/s.

Expert Solution

genius_generous answered 2 years ago

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