November 2018 Issue,
Volume 86, No. 11
Visualizing sound waves with schlieren optics
Using schlieren optics as a tool to see the invisible, we describe a technique of visualizing traveling ultrasonic (28?kHz) sound waves in real time. Suitable for lecture demonstration purposes or as an instructional laboratory experiment, our setup can readily demonstrate the reflection of sound waves from surfaces, diffraction effects around objects, interference, and standing waves. Additionally, the incorporation of color filters provides information such as gradient directions and sound wave phase differences not obtainable with just a white light source. As an example, acoustic standing waves are analyzed.
Papers
Resource Letter PB-1: The Physics of the Brain by Christian G. Fink. DOI: /10.1119/1.5054288
Experimental verification of the adiabatic transfer in Wilberforce pendulum normal modes by M. Hübner, and J. Kröger. DOI: 10.1119/1.5051179
Relativistic description of the photoelectric effect by Julio Güémez, and Manuel Fiolhais. DOI: 10.1119/1.5052359
A hybrid approach for using programming exercises in introductory physics by C. M. Orban, R. M. Teeling-Smith, J. R. H. Smith, and C. D. Porter. DOI: 10.1119/1.5058449
Self-torque and angular momentum balance for a spinning charged sphere by Béatrice Bonga, Eric Poisson, and Huan Yang. DOI: 10.1119/1.5054590
Kepler's equation and some of its pearls by SFrancisco G. M. Orlando, C. Farina, Carlos A. D. Zarro, and P. Terra. DOI: /10.1119/1.5055760
Back of the Envelope
The exponential benefits of logarithmic thinking by Sanjoy Mahajan. DOI: 10.1119/1.5058771
Physics Education Research
Transforming the content, pedagogy and structure of an introductory physics course for life sciences majors by David P. Smith, Laurie E. McNeil, David T. Guynn, Alice D. Churukian, Duane L. Deardorff, and Colin S. Wallace. DOI: 10.1119/1.5058685
Apparatus and Demonstration Notes
Visualizing sound waves with schlieren optics by Allen Crockett, and Wolfgang Rueckner. DOI: 10.1119/1.5042245
Book Reviews
The Man Who Saw Tomorrow: The Life and Inventions of Stanford Ovshinsky by Brian Schwartz. DOI: 10.1119/1.5052429
The Great Silence: The Science and Philosophy of Fermi's Paradox by G. David Brin. DOI: 10.1119/1.5053112
Books Received
American Journal of Physics 86, 880 (2018); https://doi.org/10.1119/1.5058772. DOI:
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