1. What do you notice about how the air pressure alternates from high to low under the initial conditions? d. Click on One Slit under barriers. 3. Move the detector around the area that is on the same side of the barrier as the sound source. 2. Does the pressure oscillation dierence stay the same? It not, what is causing the change to occur? f. Now, move the detector to the opposite side of the barrier from the sound source. 3. How is the pressure oscillation difference related to where the detector is located in reference to the barrier? 4. Does the pressure ever reach zero? What does this tell you about how sound behaves with a barrier? 9. Increase the slit width to the near maximum value. h. Slide the detector slowly down just to the right of the barrier