Elements of natural philosophy (Volume 2-3) (1850)
Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 92
ter * tion (30) by making sin <? = 1, wliicli gives sin <p = 0,23142 or. <p = 13° 22. Its value. § 75. When the sound is thrown back from the surface Reflected sound;separating the two media and continues in the first medium,the velocity retains the same value, but its sign will bechanged.… … 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…
Mechanics · Acoustics · Optics
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