Chapt38_VGC - Chapter 38. The End of Classical Physics...

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Unformatted text preview: Chapter 38. The End of Classical Physics Studies of the light emitted by gas discharge tubes helped bring classical physics to an end. Chapter Goal: To understand how scientists discovered the properties of atoms and how these discoveries led to the need for a new theory of light and matter. !"##$%& &(#)"*( &($ +,&$#-$.)/0)1$1 2& &) 34-#)*$% ,%- 564*$% 78"99:$1 ); &($/ .)/$ )"& %$,# $:$.&#)-$1 !: < <= !:>$ < ?,#,-,4@ A:$.&#):4121 .,% 9$ "%-$#1&))- )% &($ 9,121 ); ,&)/2. &($)#4 ); /,&&$#< !(,#*$ ,11).2,&$- +2&( $,.( ,&)/ )# /):$.":$ 2% &($ 1):"&2)%B C)12&2D$ ,%- %$*,&2D$ 2)%1B Gaseous Discharges EB !"##$%& ;:)+1 -#2D2%* -21.(,#*$ FB G21.(,#*$ .):)# -$0$%-1 )% *,1 HI F J I$)%K LB !,&()-$ *:)+ 7 M%-$0$%-$%& ); *,1 !)%%$.&2)% 9$&+$$% .):)# ); :2*(& ,%- &40$ ); ,&)/1 2% &($ -21.(,#*$ N%2;2.,&2)% ); /,&&$#<$:$.&#2.2&4<:2*(& !"#$%&!$"( 3AOMNP AQRPCOA Cathode Rays MPCS5TAG CNPCU<=O5V CSAUUNSA<= !RW5GA XO5V G5PMIRWAU>XORUU APMWU XSAAIMU3 XO5V H?ON5SAU!AI!AK U5PAW3MIX 8O5!YMIX ?O5V !#))Z$[1 W"9$1 :$- &) EBA:$.&#2. ."##$%& ,11).2,&$- +2&( .,&()-$ #,41 FBW($ #,41 ,#$ -$;:$.&$- 94 , /,*%$&2. ;2$:- :2Z$ , %$*,&2D$ .(,#*$ LB!,&()-$1 ); ,%4 /$&,: 0#)-".$ .,&()-$ #,41B S,4 0#)0$#&2$1 2%-$0$%-$%& ); /$&,: &40$B \BS,41 .,% $6$#& ;)#.$1 )% )9]$.&1B W(2% ;)2: *$&1 ()& ,%- *:)+1 #$-B Are Cathode Rays Charged Particles ? R&)/1 1()":- 9$ .)/0)1$- ); 0)12&2D$ ,%- %$*,&2D$ 0,#&1 !)%;2#/$- &(,& .,&()-$ #,41 +$#$ %$*,&2D$:4 .(,#*$- 0,#&2.:$1 9"& .)":- %)& /$,1"#$ &($ ^_/ d ! v dt = q m ( ! v ! ! B ) r = mv / qB G$;:$.&2)% -$0$%-1 )% ^_/ ,%- D ?5NIG W3RW IAXRWMTA CRSWM!OAU APMWWAG ?S5P PAWROU 3RTA W3A URPA ^_/B <= AOA!WS5IU RSA !5IUWMWNAIW 5? ROO PRWWAS Thomsons Cathode Ray Tube Old Cavendish Laboratory Punting on the Cam Cross Field Experiment d ! v dt = q m ( ! E + ! v ! ! B ) d ! v dt = v x = E / B r = mv / qB = ( m / q )( E / B 2 ) W()/1)% ;)"%- ^_/Ea EE !9_Z* ?)# 34-#)*$% ^_/Ea b !9_Z* !,&()-$ #,4 0,#&2.:$ (,1 $2&($# /".( :,#*$# .(,#*$ )# /".( 1/,::$# /,11B v y = a y t , F = m e a y , F = Ee E = V / d x e y v L t d m Ve a / , / = = d v m VLe v x e y = angles small for m e d v VL v v e x x y ! ! ! " # # $ % & & ( = = 2 tan : deflection beam V, L, and d are all measurable characteristics of the apparatus If you can measure v x , then you can determine e/m....
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This note was uploaded on 12/28/2011 for the course PHYSICS 270 taught by Professor Drake during the Fall '08 term at Maryland.

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Chapt38_VGC - Chapter 38. The End of Classical Physics...

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