Henderson, C. Hanford (Charles Hanford), 1861-1941, Woodhull, John F. (John Francis), 1857-1941 · New York, D. Appleton and company · leaf 374
Fig. 243.—Sound waves. each blow the metal draws back, and consequently sets upa similar spherical wave of rarefaction. A sound wave isspherical in shape, and consists of alternate spherical shellsof compressed and rarefied air. There are three respectsin which sounds differ: loudness, pitch, and…
Physics
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