Chemical News and Journal of Industrial Science, Tom 144,Wydanie 3755Chemical news office., 1932 |
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Strona 215
... reflection of sound from smooth walls , ceilings , or proscenium arches , just as a mirror may reflect a beam of light without scattering it . If , however , the surface of the mirror be roughened the reflected light will be diffused in ...
... reflection of sound from smooth walls , ceilings , or proscenium arches , just as a mirror may reflect a beam of light without scattering it . If , however , the surface of the mirror be roughened the reflected light will be diffused in ...
Strona 216
... sound and the rarefaction of the reflected sound arrive at the ear at the same time , neutral- ising each other's effect and producing a diminution in intensity . If the reflected sound is retarded a little more it may happen that the ...
... sound and the rarefaction of the reflected sound arrive at the ear at the same time , neutral- ising each other's effect and producing a diminution in intensity . If the reflected sound is retarded a little more it may happen that the ...
Strona 218
... sound intensity is low , the absorbing material will not be as effec- tive as if it were placed where the intensity is greater . There are also cases where between large parallel non absorbent surfaces the sound may be reflected back ...
... sound intensity is low , the absorbing material will not be as effec- tive as if it were placed where the intensity is greater . There are also cases where between large parallel non absorbent surfaces the sound may be reflected back ...
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