NASA Lewis Research Center Physical Acoustics Physical Acoustics deals with the way in which sound waves propagate in solids, liquids, gases, and plasmas, and how they interact with these materials. High-frequency sound waves in solids are called phonons because they behave like particles. Observing their behavior has helped physicists understand the quantum behavior of liquids. Subatomic particles, such as protons, muons, and even the elusive neutrino, have been detected by the sound they make as they travel at high speeds through the ocean. Many new frontiers exist in this exciting field of research.
Most researchers have advanced degrees in physics.
In much the same way that an aircraft is guided through a blinding storm by its radar system, underwater vessels such as submarine are guided through the depths of the ocean by their acoustic systems. Since the characteristics of the water environment permit sound to be transmitted over very long distances, sometimes hundreds of miles, sound is an extremely valuable tool, not only for military applications but also for commercial use. The need for technological advancements in underwater acoustics will continue to grow over the next decade as man attempts to utilize the sea to the fullest advantage. This growth will afford many rewarding job opportunities for graduates in acoustics. Bioacoustics and Medical Acoustics Bioacoustics deals with the interaction of sound waves with biological tissues in humans and animals.