FWSK=  x _     C   ?    obj Beam1 _root Disk2 _rotation Math abs speed Beam2 _visible gotoAndPlay bounds getBounds xMax _xmouse xMin yMax _ymouse yMin AllText page Slider Bar _x _y Control  MadeIt  obj     I m   N N     R  N        GH %   	O        
R mouseOver  obj         R  N  NHL    N  NHL    N  NHL    N  NH   >    >     O 
     	 O  	 O      R   NO   NO  	 O      O7B_   %>pDG      X#Q  %`Ap 	       `@  P@   @  	n@   @  @@    @  ?L     this _visible _root MadeIt     O       R    @      &  R@Beam2      l;{  f        !=&g: 
I
La|iҸ  c'@Þ2s5H H 9jO5؀T 
qaV(d U b( dT vQₜ Jp `v  	        @      &  Ǚw*Disk2 	       `@  P@   @  	n@   @  @@    @  ?L     this _visible _root MadeIt     O       R    @      &  U Beam1    &  		!XjDisk1      d=T7    7 ]@          "55dJ@m @I@4 _M )*Tk+l  D{(fj %g %2ƛ`{X-/ [' Z9iYtt i 	        @     	  sA`Control   2    {  b _root Slider getBounds total yMax yMin part Bar _y speed rps Disk1 _rotation Disk2 Math abs Beam1 _visible gotoAndPlay        N R   N   N   N  N 	N  
  2       GO   
N	 Q8:@   O  N  N N  
NGO  N  N N  
NGO  N N     R  
N        GH 1   N O        N R     8 	 _root Bar mouseOver b Slider getBounds xMin yMin yMax    N      R k         N R  N  N  N  N              N'      (       	 _  %~\C	   
   	  @    
 G ?    Times New Roman. ^ `   7HW5?ZtCK			Y
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-:eyWPuۗU , 5iّgJl}:	@2H"K,`9Q	&;$L  ˒c>3(6jTׅT@ <t`S MU[V2@*Y F*h$ 5j6f0P j Ϛ`GFeV IEJ\%۪	mE'L 	9ȌTAXӱkXt΀	u_5|@F 5g^nQPĬ) h%к_3{\ۖ5SFbOAAMeW%ѻAm$C#.핀hQo"J[/Y]6I 5`jx-(%@PSP&E`4R෴nbU@	g d@MMVF 5`Vx=IQ\!/ RR fSK8QYѨ5(z7h3*J+2T .V@hOh 5lfx[@>BReT _E.F%X iE;օqe q	IPA"7h1*J/2,)'8ݾ}m`sO򽻌)ƥ@ 5gw)Q-PKԀ<BypR|8ʧƊ[MXY~]JzS捻,<.2`65h ˪s!Jp)nRvs%?b !)2ɀh5v2 O$ %L.V@hOnz|!+2	JP`iخkAL c1 ٱ6  5ib-nۤ97*6(yP4!)2 h/ãv K4 ~+ރ16.h[aE[ 5gw)O]z!ۜ\@UR|8ʩ\J,ҋ>rk
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۴-:V ,#O7oEr4 5b\JFc2qſBZr 6o;%v'kT{Z)nHnq@idĠkdE-Ⱦң GƔ/F8e,?;9595bS4:@)nGn֯lɣ(~ +p Y~w}6u<]\ 5GD喹m&^ҀZlfsm#7kY6є?j;~Ty<ݽWe[/kZgU`kg&QLT"
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#ր PpPpX[X PF PF  	&    _z`    f       ( _root.rps   <     _ J     %r	        @      &  XhSlider  H    Uya"   3     5,/f3MW0Ro{42 a 	        @      &  ؠBar 	    g/ 3         (  <P ALIGN="LEFT"><FONT FACE="Times New Roman" SIZE="12" COLOR="#FFFFFF"><A HREF="http://home.earthlink.net/~spencerdoolin/relativity/time3.swf">Next Movie</A></FONT></P>   d䨿R    uy}\p 333   333 "%Hħl|    5xIV!F] 2   e(> GJD     ===GM0     ===  U>?pL\.<#r ]ۏ4R\9rqo 	hB  qqqGJD     === xxx  333 WWW sss        fffB=Ee Cn"CȷQ<N#uj$8n~ pBFե Ix7
0"C0:FL ]Š֮uL񶚘@BA'j0W trwJCV_pU     e(>     BA䉜n9P\       333hB  qqq xxx  WWW sss   fffB`R"$@9[~`C`#u0	w驂
 ZZ=ar;>HCʰ뀋`|= f@WX:HML t ju!_BO¹{TD$A}Tï8C '   f'^    BA䉜n9P\     `Nzhu9",x7C 	      333      xxx sss WWW   fffB=an)skDLoJ'U0Hd< Ź-W!ͯVuqp8QjJw`q u0`Ih/$=9dP$۬Iai &@@`j@K`-$0VDu}AUnV*@ 2    f'^    `JpCtrD#9dB` d                        this page      N    GO   N                           page this gotoAndStop      H 0           N     R 	    b           ( TextField4 This example shows how a device can be built to measure the speed of light.  Use the slider to the right to adjust the speed of the spinning disk until a light ray canpass through both holes. 	       j_@@    3    qǉX <      !F%=t##t]UF      p K `. 	   9ZtV1BF  A:Y+!˯$<Rxǅu5<p!g 5<Z[f`'.xA.5֭xٮbf(Hx<
< x   @@g <٭\(Zx|%   ?    mr&  %NFA9RRn+zLMͤg'{.p 	.    _qa5           ( TextField5 1 Foot 	F    g,g          ( TextField6 MillionRevolutionsper second 	d    d          ( TextField14 Now that you have the light passing through both holes in the disks, I present to you a hurdle you may have to overcome.  Examine how fast the disks are turning!Achieving such a rotational speed would be nearly impossible, but we can reduce the speedthe disks have to turn by changing thedistance between them. 	3   !       ʮ  c   c.i @    }   " m6^eh&       %ٵ^lM[W>#!S:yՍXCHP#ZB&cZ40-?d¦LYh/XѴn0=0mwӝc	   #   "  @   	  $ ?π          ( TextField4 To bring this angular velocity down to more reasonable levels, we have to extend the distance between the plates to obnoxious lengths, and even then it isvery difficult to find materials that can withstand the angular momentum. 	1   % _qa5           ( TextField5 1000Feet 	G   & g,g          ( TextField6 ThousandRevolutionsper second 	3   '   $ _    % ʮ & c@   	   ( π          ( TextField4 A reasonable rate of speed for the disks would occur if the disks were about a million feetapart., but who has 189 miles of empty field to build science experiments in?  ?   ) mr&  %NFA9RRm3xAn+zLM'{.p 	5   * _qaπ          ( TextField5 1millionFeet 	>   + g,g          ( TextField6 Revolutionsper second 	3   ,   ( _ )   * ʮ + c@      - n1<t     %5©
4>    %z!C[/o`]w!odl߷j7     %A+> 	   .   -  @   	  / π          ( TextField4 Also, instead of setting the disks so that the holes are 180 degrees apart, you could set them so theywere closer together, reducing the angular velocity needed by the same factor.  Try putting therotation speed around 107 now. 	1   0 _qaπ          ( TextField5 1000feet 	G   1 g,g          ( TextField6 ThousandRevolutionsper second 	3   2   / ^~|     0 ʮ 1 c@    ,   3 p\0   %r9j'  	'  4 j           ( TextField4 Despite the difficulties of measuring the speed of light, it has been done to great precision.Louis Fizeau used a method very similar to this one to measure the speed of light.  There is a greatWebsite about the quest to measure the speed of light at  	   5   4 h/@@    %   6 u|P  4~pОfp 	   7 w	G 3           (  <P ALIGN="LEFT"><FONT FACE="Times New Roman" SIZE="12" COLOR="#FF0000"><A HREF="http://www.what-is-the-speed-of-light.com">http://www.what-is-the-speed-of-light.com</A></FONT></P>    8 h X   	   &1AIƏ#<* 5C yACMr"\6k xs[& <6k٬   x𹮣f<PCU9tK5<!׏+V<!%  	H  9 w3X          ( TextField4 Just in case, I'll tell you how fast the speed of light is.Since we have 500 Million Revolutions per second, the disk rotates halfway 1 billion times per secondThis means that the light beam travels one foot in one nanosecondWhich is roughly 186,000 miles per second or 300,000 km/s. 	.   : _qa5           ( TextField5 1 Foot 	F   ; g,g          ( TextField6 MillionRevolutionsper second 	  < o3         (  <P ALIGN="LEFT"><FONT FACE="Times New Roman" SIZE="12" COLOR="#FFFFFF"><A HREF="http://home.earthlink.net/~spencerdoolin/relativity/time3.swf">Click here to see the next</A></FONT></P><P ALIGN="LEFT"><FONT FACE="Times New Roman" SIZE="12" COLOR="#FFFFFF"><A HREF="http://home.earthlink.net/~spencerdoolin/relativity/time3.swf">movie where we&apos;ll start</A></FONT></P><P ALIGN="LEFT"><FONT FACE="Times New Roman" SIZE="12" COLOR="#FFFFFF"><A HREF="http://home.earthlink.net/~spencerdoolin/relativity/time3.swf">getting into the REAL</A></FONT></P><P ALIGN="LEFT"><FONT FACE="Times New Roman" SIZE="12" COLOR="#FFFFFF"><A HREF="http://home.earthlink.net/~spencerdoolin/relativity/time3.swf">gist of relativity!</A></FONT></P> 	?   =   9 X>    : ʮ ; c < s
N@   	   > g/ 3         (  <P ALIGN="LEFT"><FONT FACE="Times New Roman" SIZE="12" COLOR="#FFFFFF"><A HREF="http://home.earthlink.net/~spencerdoolin/relativity/time3.swf">Next Movie</A></FONT></P> 	S  ?  ?    ?L     _root Disk2 _rotation Disk1    N   N N    GO        DE܉  9  e  @     fG^@   ! &  # 5i @ @   ' &  ēU6@   ?L     _root Disk2 _rotation Disk1    N   N N    GO  , & @  ?L     _root Disk2 _rotation Disk1    N   N N (   O     . RG&)@     w     this _visible _rotation    N G      N    O   N H      O    2 & @   ?L     _root Disk2 _rotation Disk1    N   N N    GO  3   5 '  6   7 zW  8 .@       = 9-     >  @    @    @ @      & ? AllText  &   @ p>8 333 59>)N-DbUx & @  	v  A g-3         (  <P ALIGN="LEFT"><FONT FACE="Times New Roman" SIZE="12" COLOR="#FFFFFF"><A HREF="http://home.earthlink.net/~spencerdoolin/relativity/wavereflect.htm">Table of</A></FONT></P><P ALIGN="LEFT"><FONT FACE="Times New Roman" SIZE="12" COLOR="#FFFFFF"><A HREF="http://home.earthlink.net/~spencerdoolin/relativity/wavereflect.htm">Contents</A></FONT></P> ' A ӎ @   
