Hi Tony, I agree that Figure 1.13 has the radians conversion missing. I generated the same plot in Excel (both with and without the Pi/180 factor) to confirm your observation. As you pointed out correctly, in calculations, delta theta should be in radians. It's a common mistake that I observe with undergraduates who use Excel for Bragg's law (since the argument for the sin function in Excel should be in radians too). Well spotted! Jeremy Karl.
*************************************************************************************** Dr Jeremy Karl Cockcroft Department of Chemistry, UCL Christopher Ingold Laboratories, 20 Gordon Street, London WC1H 0AJ, UK ***************************************************************************************
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