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diff --git a/1427/CH20/EX20.13/20_13.sce b/1427/CH20/EX20.13/20_13.sce
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+//ques-20.13
+//Calculating binding energy per nucleon for Krypton
+clc
+M=83.9115;//atomic mass of Krypton (in amu)
+mp=1.00727;//mass of proton (in amu)
+mn=1.008665;//mass of neutron (in amu)
+me=0.000548;//mass of electron (in amu)
+dm=36*mp+48*mn+36*me-M;//mass defect
+BE=(dm*931)/84;
+printf("The binding energy per nucleon for Krypton is %.6f Mev.",BE);