Abstract
The phenomenon of total internal reflection has been employed in developing a technique for measuring the ultrasonic velocities in solids using pulsed ultrasonic beams. The ease and accuracy with which the critical angles can be measured make this method superior to other methods in some respects. Besides the longitudinal velocities, torsional velocities have also been measured in a number of Indian rocks for the first time. It is essential to use fairly large sized samples in this method. An earlier observation indicating a dependence of sound transmission on granular texture of the rocks has been confirmed qualitatively in this investigation as well.
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