Hey all 1. Two speakers emit sound in phase with the frequency of 13.2 kHz, the sound from the loudspeakers directed at points A , B and C. Rank the volume of the three points with the weakest first. speed of sound 340m/s 2. 3. I think I need to use Pythagoras says to calculate the path difference from H1 TO A. This is what i have done but I am sure it's wrong. 60^2+220^2=52000 root square of (52000)= (20) root square (130). I don't really know what I am doing my self.