The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 657
... velocity P C ' Y Group velocity . The phenomenon of group velocity as distinct from wave velocity is a case in point . If waves occur in a group , as they normally do , the individ- ual waves travel with the velocity c = Vg , but those ...
... velocity P C ' Y Group velocity . The phenomenon of group velocity as distinct from wave velocity is a case in point . If waves occur in a group , as they normally do , the individ- ual waves travel with the velocity c = Vg , but those ...
Page 668
Phase velocity Velocity of light in a transparent medium 35 30 A. ment of the sine function is diminished by the ratio x / x -i.e. , - y = A sin 2π ( ft − 1 ) . ( 3 ) Equation ( 3 ) applies to an infinitely long string undergo- ing ...
Phase velocity Velocity of light in a transparent medium 35 30 A. ment of the sine function is diminished by the ratio x / x -i.e. , - y = A sin 2π ( ft − 1 ) . ( 3 ) Equation ( 3 ) applies to an infinitely long string undergo- ing ...
Page 671
... velocity of the beat or wave train is called the group velocity ( see Figure 6 ) . At this point , another definition is required , namely , the wave number k , which is simply the reciprocal of the wavelength ; i.e. , k = 1 / λ . If ...
... velocity of the beat or wave train is called the group velocity ( see Figure 6 ) . At this point , another definition is required , namely , the wave number k , which is simply the reciprocal of the wavelength ; i.e. , k = 1 / λ . If ...
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