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diff --git a/2243/CH6/EX6.7/Res6_7.txt b/2243/CH6/EX6.7/Res6_7.txt
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+ Photoelectric effect :
+
+Electron energy : 3.9 eV 
+ Electron momentum  : 1.07 x 10^-24 kg m/s 
+ Momentum of incident photon : 3.31 x 10^-27 kg m/s 
+ pe/pp : 322 
+
+Compton  effect :
+
+Electron energy : 568.9 eV 
+ Electron momentum  : 1.3 x 10^-23 kg m/s 
+ Momentum of incident photon : 6.63 x 10^-24 kg m/s 
+ pe/pp : 1.94 
+
+ 
+\ No newline at end of file