Waves And Ripples in Water Air And Ther Being a Course of Christmas Lecture
Waves And Ripples in Water Air And Ther Being a Course of Christmas Lecture
John Ambrose Fleming
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Bend back the paper on itself at the dotted line db, and let one half represent the arriving wave, and the other the reflecting wave. It will be seen that in this case the crests of the incoming wave are obliterated by the hollows of the returning wave. If, however, the paper is bent back at cd, then the crests of the reflected and incident waves conspire, and there is no interference. Whenever we can produce interference in this manner between two sets of sound-rays, or light-rays, or rays of ...any other kind, we have the strongest possible proof that we are concerned with a wave-motion ; because in no other way that we can understand is it possible that a destruc- tion of sound by sound can take place by, so to speak, superimposing two sound-rays, or a destruction of light by bringing together two rays of light. We may, then, conclude our discussion of this part of our subject by examining the manner in which vibrating 142 WAVES AND RIPPLES. bodies communicate a different form of wave to the air.
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