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Figure 1 Diffraction of a parallel X-ray beam along the z-axis. The angle between the crystal and the y-axis is �. 7+(���VW�,17(51$7,21$/�3+<6,&6�2/<03,$'������� *521,1*(1��7+(�1(7+(5/$1'6 +DQV�-RUGHQV 'HSDUWPHQW�RI�6FLHQFH�DQG�7HFKQRORJ\��8QLYHUVLW\�RI�*URQLQJHQ��7KH�1HWKHUODQGV� 4XHVWLRQ��� ;�UD\�'LIIUDFWLRQ�IURP�D�FU\VWDO� :H�ZLVK�WR�VWXG\�;�UD\�GLIIUDFWLRQ�E\�D�FXELF�FU\VWDO�ODWWLFH��7R�GR�WKLV�ZH�VWDUW�ZLWK�WKH GLIIUDFWLRQ�RI�D�SODQH��PRQRFKURPDWLF�ZDYH�WKDW�IDOOV�SHUSHQGLFXODUO\�RQ�D���GLPHQVLRQDO JULG�WKDW�FRQVLVWV�RI�1��[�1��VOLWV�ZLWK�VHSDUDWLRQV�G��DQG�G���7KH�GLIIUDFWLRQ�SDWWHUQ�LVREVHUYHG�RQ�D�VFUHHQ�DW�D�GLVWDQFH�/�IURP�WKH�JULG��7KH�VFUHHQ�LV�SDUDOOHO�WR�WKH�JULG�DQG /�LV�PXFK�ODUJHU�WKDQ�G��DQG�G�� D�� 'HWHUPLQH�WKH�SRVLWLRQV�DQG�ZLGWKV�RI�WKH�SULQFLSDO�PD[LPXP�RQ�WKH�VFUHHQ� 7KH�ZLGWK�LV�GHILQHG�DV�WKH�GLVWDQFH�EHWZHHQ�WKH�PLQLPD�RQ�HLWKHU�VLGH�RI�WKH PD[LPD� :H�FRQVLGHU�QRZ�D�FXELF�FU\VWDO��ZLWK�ODWWLFH�VSDFLQJ�D�DQG�VL]H�1��D�[�1��D�[�1��D����1��LVPXFK�VPDOOHU�WKDQ�1���7KH�FU\VWDO�LV�SODFHG�LQ�D�SDUDOOHO�;�UD\�EHDP�DORQJ�WKH�]�D[LV�DWDQ�DQJOH����VHH�)LJ������7KH�GLIIUDFWLRQ�SDWWHUQ�LV�DJDLQ�REVHUYHG�RQ�D�VFUHHQ�DW�D�JUHDW GLVWDQFH�IURP�WKH�FU\VWDO� E�� &DOFXODWH�WKH�SRVLWLRQ�DQG�ZLGWK�RI�WKH�PD[LPD�DV�D�IXQFWLRQ�RI�WKH�DQJOH����IRU VPDOO���� ��� :KDW�LQ�SDUWLFXODU�DUH�WKH�FRQVHTXHQFHV�RI�WKH�IDFW�WKDW�1�����1�� 7KH�GLIIUDFWLRQ�SDWWHUQ�FDQ�DOVR�EH�GHULYHG�E\�PHDQV�RI�%UDJJ V�WKHRU\��LQ�ZKLFK�LW�LV DVVXPHG�WKDW�WKH�;�UD\V�DUH�UHIOHFWHG�IURP�DWRPLF�SODQHV�LQ�WKH�ODWWLFH��7KH�GLIIUDFWLRQ SDWWHUQ�WKHQ�DULVHV�IURP�LQWHUIHUHQFH�RI�WKHVH�UHIOHFWHG�UD\V�ZLWK�HDFK�RWKHU� F�� 6KRZ�WKDW�WKLV�VR�FDOOHG�%UDJJ�UHIOHFWLRQ�\LHOGV�WKH�VDPH�FRQGLWLRQV�IRU�WKH�PD[LPD DV�WKRVH�WKDW�\RX�IRXQG�LQ�E� Figure 2. The cubic latice of Potassium Chloride in which the K+ and Cl-wons have almost the same size. Figure 3. Scattering of X-rays by a powder of KCl crystals results in the production of concentric dark circles on a photographic plate. Figure 1 The spaceship Atlantis (A) with a satellite (S) in an orbit around the earth. The orbit lies in the earth’s equatorial plane. 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