What is the best explanation for a pattern such as those obtained when X Rays

What is the best explanation for a pattern such as

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19. What is the best explanation for a pattern such as those obtained when X-Rays are diffracted by crystals? A. The photons and the anti-photons cancel each other out. B. The waves of electromagnetic radiation arrive in-phase and out of phase at the detector. C. The X-rays eject electrons which interfere with each other. D. As the beam X-rays arrives the peaks give a bright spot and the troughs give a dark spot on the detector. 20. Which one of these would represent a covalent bond?
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4 Possibly useful information:h = 6.626 ×10–34 J.s c = 3.0 ×108m/s 1 J = 1kg.m2/s2l= h / mv c = lnE = h n!"= ࠵?࠵?&[!()*- !(**]R = 1.09737x107m-1 Z is the atomic number for the element given 1H1.0083Li6.94111Na22.9919K39.1037Rb85.4755Cs132.9187Fr(223)4Be9.01212Mg24.3120Ca40.0838Sr87.6256Ba137.3388Ra(226)21Sc44.9639Y88.9157La138.9189Ac(227)22Ti47.8740Zr91.2272Hf178.49104Rf(267)23V50.9441Nb92.9173Ta 180.95105Db(268)24Cr52.0042Mo95.9474W183.84106Sg(271)25Mn54.9443Tc(98)75Re186.21107Bh(270)26Fe55.8544Ru101.0776Os190.23108Hs(277)27Co58.9345Rh102.9177Ir192.22109Mt(278)28Ni58.6946Pd106.4278Pt195.08110Ds(281)29Cu63.5547Ag107.8779Au196.97111Rg(281)30Zn65.3948Cd112.4180Hg200.59112Cn(285)5B10.8113Al26.9831Ga69.7249In114.8281Tl204.38113Aug 2003(286)6C12.0114Si28.0932Ge72.6150Sn118.7182Pb207.19114Fl(289)7N14.0115P30.9733As74.9251Sb121.7683Bi208.98115Feb 2004(289)8O16.0016S32.0734Se78.9652Te127.6084Po(209)116Lv(293)9F19.0017Cl35.4535Br79.9053I126.9085At(210)117Apr 2010(294)2He4.00310Ne20.1818Ar39.9536Kr83.8054Xe131.2986Rn(222)118Oct 2006(294)71Lu174.97103Lr(262)70Yb173.04102No(259)69Tm168.93101Md(258)68Er167.26100Fm(257)67Ho164.9399Es(252)66Dy162.5098Cf(251)65Tb158.9397Bk(247)64Gd157.2596Cm(247)63Eu151.9695Am(243)62Sm150.3694Pu(244)61Pm(145)93Np(237)60Nd144.2492U238.0359Pr140.9191Pa231.0458Ce140.1290Th232.0412345671A8A2A3A4A5A6A7APERIODIC TABLE OF THE ELEMENTSFor elements Tc, Pm, and those beyond Bi, a number in parentheses is the mass number (not the atomic mass) of the most stable or the only known isotope.1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 183B4B5B6B7B8B1B2B
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  • Spring '08
  • JeffreyJoens

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