$1)$ a$)$HMK demirden $(220)$ d$$zlemi i$$in a$)$ d$$zlemler aras mesafeyi ve b$)$ k$$r$$n$$m a$$s$$n$$ hesaplay$$n$$z$.$ Demirin

kafes parametresi $0\mathrm{.}286$ nm$$dir$.$ Ayr$$ca yans$$ma derecesinin $($n$=1)$ oldu$$unu ve dalga boyunun $0\mathrm{.}1790$

nm oldu$$unu kabul ediniz. b$)$ in XRD How do contructive and destructive interferences of Xrays occur, and what role do they play in determining the difraction pattern of a crystal?