Elements of natural philosophy (Volume 2-3) (1850)
Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 92
Angle ofincidence equalto that ofreflexion. § 76. When the pulse proceeds ina homogeneous medium from a pointof disturbance, it takes a sphericalshape, the normals all meet at thecentre of the sphere, and the raysare then said to diverge from a point,in which case the sound becomesless intense as… … Intensitydiminishes: 84 NATURAL PHILOSOPHY. Convergingsound; Intensity-increases ; Fig. 43. When in the progress of the pulse it retains its spheri-cal shape, but any portion of it be-comes so modified as to present itsconcavity in front, the rays will meetat some point in advance, and aresaid to…
Mechanics · Acoustics · Optics
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