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Sound reflections in and under oceans
Since World War II, when many physicists contributed to the development of underwater acoustics, oceanographers have studied marine animals with sound‐scattering techniques and have used seismic reflections to map sedimentary layers deep beneath the ocean floor. The author presented the paper on which this article is based as an invited address at the 8th annual meeting of the Corporate Associates of the American Institute of Physics on September 30.
Photoproduction of mesons and hyperons
The availability in recent years of increasingly energetic photon beams from particle accelerators has led to significant advances in the study of photon‐nucleon interactions and the photoproduction of mesons and hyperons. This work also holds the promise of future contributions to better understanding of the nature of the strong interactions.