Abstract
IT has been well established1,2 that, in the case of diffraction of light by very-high-frequency sound waves only the first order of diffraction appears in the field of view and it attains the maximum intensity when the sound wave-front is tilted to the corresponding Bragg reflexion angle. Any further tilt from this position results in gradual diminution of intensity and finally in the disappearance of the diffraction order. The angle over which the intensity of the diffraction order is distributed is called the ‘angular width of high-frequency diffraction’.
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References
Rao, B. R., thesis, Andhra University (1948).
Rao, C. R., thesis, Osmania University (1953).
David, E., Phys. Z., 38, 587 (1937).
Rao, C. R., Nature, 193, 1169 (1962).
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RAGHUPATHI RAO, C. Dependence of Angular Width of High-frequency Diffraction on Sound Wave-length. Nature 197, 677–678 (1963). https://doi.org/10.1038/197677b0
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DOI: https://doi.org/10.1038/197677b0
