# Difference between revisions of "Dictionary:Divergence"

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<b>1</b>. The decrease in amplitude of a wavefront because of geometrical spreading. The energy in body waves spreads out as the spherical wavefront expands, causing the energy density to vary inversely as the square of the distance (<b>spherical divergence</b>). With surface waves the energy density varies inversely as the distance (<b>cylindrical divergence</b>). Tube waves do not suffer energy loss because of divergence. Energy density also decreases because of raypath curvature, absorption, and other reasons. <b>2</b>. The divergence of a vector field is expressed in Figure [[Special:MyLanguage/Dictionary:Fig_C-14|C-14]] for rectangular, cylindrical, and spherical coordinates. | <b>1</b>. The decrease in amplitude of a wavefront because of geometrical spreading. The energy in body waves spreads out as the spherical wavefront expands, causing the energy density to vary inversely as the square of the distance (<b>spherical divergence</b>). With surface waves the energy density varies inversely as the distance (<b>cylindrical divergence</b>). Tube waves do not suffer energy loss because of divergence. Energy density also decreases because of raypath curvature, absorption, and other reasons. <b>2</b>. The divergence of a vector field is expressed in Figure [[Special:MyLanguage/Dictionary:Fig_C-14|C-14]] for rectangular, cylindrical, and spherical coordinates. | ||

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## Latest revision as of 20:06, 3 April 2017

**1**. The decrease in amplitude of a wavefront because of geometrical spreading. The energy in body waves spreads out as the spherical wavefront expands, causing the energy density to vary inversely as the square of the distance (**spherical divergence**). With surface waves the energy density varies inversely as the distance (**cylindrical divergence**). Tube waves do not suffer energy loss because of divergence. Energy density also decreases because of raypath curvature, absorption, and other reasons. **2**. The divergence of a vector field is expressed in Figure C-14 for rectangular, cylindrical, and spherical coordinates.