= João M. B. Lopes dos Santos
{c}
<João M. B. Lopes dos Santos> coauthored an inexpensive <speed of sound> experiment using two microphones and a computer's stereo sound input. A pulse reaches microphones at different distances at different times; dividing the path difference by the arrival-time difference estimates the propagation speed. Recording both channels together makes the relative delay directly accessible. The apparatus turns wave propagation into a quantitative measurement using familiar audio equipment.<A time of flight method to measure the speed of sound using a stereo sound card by Carlos C. Carvalho and others>[abstract: two-microphone time-of-flight apparatus and laboratory use]{ref}
\Image[https://sigarra.up.pt/fcup/pt/noticias_geral.noticias_cont?p_id=F-1923240521%2Fjplopessantos-sigarra.png]
{title=Portrait of <João M. B. Lopes dos Santos>}
{description=SICC/RS (credit printed beneath the source photograph). External portrait hosted by University of Porto, Faculty of Sciences. Source credit: SICC/RS.}
{source=https://sigarra.up.pt/fcup/pt/noticias_geral.ver_noticia?p_nr=87955}
{width=250}
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