The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 21
... waves , which are much the easiest to study analytically ( see the section on the properties of sound waves ) . Waves are called har- monic waves because they result from a source of sound in which the disturbance repeats itself ...
... waves , which are much the easiest to study analytically ( see the section on the properties of sound waves ) . Waves are called har- monic waves because they result from a source of sound in which the disturbance repeats itself ...
Page 26
... waves of certain frequencies well , but fail entirely to pass waves of other frequencies . Further theoretical study in- dicates that this result can be realized approximately by a structure consisting of a sequence of alternating ...
... waves of certain frequencies well , but fail entirely to pass waves of other frequencies . Further theoretical study in- dicates that this result can be realized approximately by a structure consisting of a sequence of alternating ...
Page 27
... wave fronts . For audible waves ( in air greater than about two centimetres or 0.8 inch ) , how- ever , this type of shadow - forming scattering is important only for relatively large obstacles . At the opposite extreme , if the ...
... wave fronts . For audible waves ( in air greater than about two centimetres or 0.8 inch ) , how- ever , this type of shadow - forming scattering is important only for relatively large obstacles . At the opposite extreme , if the ...
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