Abstract
A theoretical investigation of diffraction of plane waves by a transmission grating shows that the expressions for the intensity of a given order of diffracted beam are not the same for light and sound waves. The latter is cos2θ times the former, where θ is the angle of diffraction. This result has considerable effect on the relative distribution of intensity among the various orders in the two cases. The foregoing theoretical result is verified experimentally in the case of high-frequency sound waves in a liquid diffracted by a wire grating immersed in the liquid.
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