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Two speakers are separated by a distance of 2.3m. A point P is placed at 4.7m from one of the speakers...

Two speakers are separated by a distance of 2.3m. A point P is placed at 4.7m from one of the speakers so that they form a right triangle. If the speed of sound in this situation is 344m/s and the speakers are in phase, what is the lowest frequency for which the intensity at P is:

a) a maximum?
 
b) a minimum?

The 2nd harmonic of a string of length 45cm and linear mass density 2.6g/m has the same frequency as the 5th possible harmonic of a closed pipe of length 1.4m. Find the tension in the string. 
 

**Use 340 m/s for the speed of sound in air.

I tried 48.51992984693878 Newtons as an answer for the tension in the string, but that's incorrect.

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