Acoustic Particle Setup (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption Photograph of the experimental setup, which consists of a 2-meter-long acrylic tube with funnels at both ends to direct the sound from a computer speaker (bottom left) out to absorbing media (top right). A web camera is set above the setup to track the motion of the particles, and a microphone is inserted into the output funnel to measure the transmission spectrum in time. Credit Credit: Chad Ropp/Berkeley Lab Usage Restrictions Editorial use only. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.