We determined the densities of several samples. It helped us to confirm that our results aren't similar to these taken from literature (attenuation factor, velocity of sound in material). But it doesn't prove that obtained values of eg. velocity of longitudinal wave are incorrect in general. We checked the calibration of probes using calibrating block. As it turned out, everything is set very well. As a conclusion we can say that some variances between values obtained from measurements and literature aren't similar but correct. We won't discuss this issue anymore. Now we need to focus on realizing the measurements of chosen physical quantities in different samples (thickness, velocity of sound) and checking that there's no further problems. We hope to be able to start writing instruction next week.
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