WPCc 2$a86ujqccf9A϶k9<=6-]%vO;҆}6^U2pM)v#[0J°)GAl~ D,U@][}ty'P]D zg>n]@~˔<ޚg=ۻ8ǽ{fX앎HBhezǕ"r?]1($`j0mS0C{YPK)>s`C B\/LMh uYl0!2#ՀݔEō}j!i?9|BÞi"g)beἋ̉F6A#}A~JLu^֏޿yhfCvlC›|svBt s**>>(hx7;ę!;T*#zq~ ((UA9'FJ(Iܺ2“v %pvF (ļx14P|0# UN % 0(w@'4g{;d>dud- u dB $ d              0D D+ AY W 0FIBM Laser Printer 4019IBM4019,,,,0 (9 Z 6Times New Roman RegularX($ { !V"#E$%U&e9"3|x& 1{Usubtot(bcc)}over{Usubtot(fcc)}=0.9577zXHXX)UytotXXJ(XXbccXX)XX=xU7totXX^x(XXxfccXXx)XXXXu0XX.XX 9577 4{omega}over{esup{{omega}overtau}1}9 X*XX)XX>)3XX@GeXHH3)XXGXXG1 kbVECsub3=2pi{avecsub1timesavecsub2}over{{avecsub1}"avecsub2timesavecsub3}XX=J/XXb3XXXX=2XX!_X*HXX/XXa y1XXd'XX/XXa8y2XXUx/XX@xa71XXx"XXMx/XX8xa72XXx'XXex/XXPxa73 kbVECsub3=2pi{avecsub1timesavecsub3}over{{avecsub1}"avecsub2timesavecsub3}XX=J/XXb3XXXX=2XX!_X*HXX/XXa y1XXd'XX/XXa8y3XXUx/XX@xa71XXx"XXMx/XX8xa72XXx'XXex/XXPxa73 sigmaoverRsubo=0.936X*HXXk%XX@xR7oXXXX0XX.XX,936(3$ !  'dxd. /#M << deUULevel 1Level 2Level 3Level 4Level 5(n$ (  1  ) !  &&&&&&&&"0"#"/"#$2/08/97$"01/17/97"&&&&DearDr.Kittel,  IamanundergraduatestudentatSamHoustonStateUniversityinHuntsville,Texas.LastsemesterItookthedepartmentscourseonsolidstatephysicsusingyourbookIntroduction L  toSolidStatePhysics,seventhedition.Whilethebookwasquiteusefulinhelpingmegrasp 8  someoftheconceptsofsolidstate,Ifoundafewproblemswithit,thatalthoughImsuretheyhavealreadybeenbroughttoyourattention,Ifeltitnecessarytowritetoyouaboutthem.  Inchaptertwoonpage49yoursummaryshouldcontainthefollowingcorrection:c- -` 0  `Ex< d t c (#(#     (#(#andnot:c--` 0  `E^x< d t\ c (#(#     (#(#asyoursummarywasmisprinted.  Onpage122inequation25thefinalsetofparenthesisintheintegralforUshouldbe:   c- -` 0  `Ex d uc (#(#     (#(#inwhichboththenumeratorandthedenominatorhaves. X  &&    TherearealsotwopartsofyourbookthatIhavequestionsoverthevalidityofyourstatements.  Thefirstisonpage92inproblemnumbertwo.Youstatethattheansweris0.956butyetmyclassfoundaslightlydifferentanswer.Wefoundthattheanswershouldinfactbe:c- -` 0  `E&x<Y dt& c (#(# &"% Wethendeterminedthatinordertogettheansweryougotof0.956wewouldhavetoincorrectlyroundtheanswerof:c--` 0  `Ex  diC c (#(#     (#(#downto0.93andnotleaveitat0.936.&&&&&&  TheotherquestionIhaveisfoundonpage187inequation34.Youhavethelimitsoftheintegralgoingfrom0to1fortheboundaryconditions.Shouldthisbeintegratedinsteadoverthelimitof0toaseeingashowawouldbetheperiodic&lentgh&&length&andnot1?Iamwonderingifthisand $  thepreviouspartIhavestatedareactualmistakesorifIIamtheonemakingamistakesomewhereinstead.Couldyou possibly clearthisupforme?&&  Also,whilethesearenotmistakes,Ithoughtthattheyshouldbebroughttoyourattention.  Onpage171,inproblem10,youremindthereaderthat 1k2is103ohms.Whilethisis H obviouslyquitetrue,myclassmatesandIfeelthatonewhohasjustsuccessfully crankedoutthestaticmagnetoconductivitytensorinthepreviousproblemshouldbefarenoughalonginphysicstorealizeyourstatementwithouthavingtoberemindedthattheprefixkiloisindeed103.  \   Itisalmostinsultingtoourabilitiesthatyoucontinuedalongwiththisobviousnessonpage177whenyouremindedthereaderthat Awavethattravelsneithertotherightnortotheleftisastandingwave:itdoesntgoanywhere.Again,thosewhohavemadeitfarenoughintheirpursuitofaphysicsdegreetotakethiscourseshouldnothavetoberemindedofthedefinitionofastandingwave.  OneothersuchstatementIhavenoticedisonpage191iswhereyoustatethat ThemarkovertheKiscalledatilde.WhileIwilladmitthatthetildeisalesserknownsymbol,itshould X  notmakeadifferenceastowhatthesymboliscalled,onlywhatitrepresents.  Dr.Kittel,innowayamItryingtotellyouhowyoushouldwriteyourbooks,especiallyinthelastfewsectionsIhavementioned.Farbeitfrommetotellsomeonewhocanruncirclesaroundmyknowledgewhattodo.Ijusthopedtopointoutafewsuggestionstohelpmaketheeventualeightheditionoryourbookabitbetter.&&!  '#& !With&&&&muchregard.Sincerely,&&%%&&&&&&%%&&&&EricL.RobertsIII1235Josey#282Huntsville,TX77340stdelr01@unx1.shsu.eu