 | Helena Petrovna Blavatsky - 1888 - 856 páginas
...theory which teaches us about light and sound and the effect of two waves of equal length meeting. " If the two sounds be of the same intensity, their coincidence produces a sound four times the intensity of either, while their interference produces absolute silence." Explaining... | |
 | Helena Petrovna Blavatsky - 1917 - 428 páginas
...theory which teaches us about light and sound and the effect of two waves of equal length meeting. " If the two sounds be of the same intensity, their coincidence produces a sound four times the intensity of either, while their interference produces absolute silence." Explaining... | |
 | 1892 - 724 páginas
...the phenomena to which it is sought to be applied. Prof. John Tyndall, FRS, says of musical sounds, "if the two sounds be of the same intensity, their...of four times the intensity of either; while their opposition produces absolute silence. " (On Sound, p. 384, 3d ed.) "Thus," he says, "by adding light... | |
| |
But if the condensations of the one system coincide with the rarefactions of the other, a destruction total or partial of both systems is the consequence. ... If the two sounds be of the same intensity their coincidence produces a sound of four times... 
