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diff --git a/24/CH43/EX43.5/Example43_5.sce b/24/CH43/EX43.5/Example43_5.sce
new file mode 100755
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+++ b/24/CH43/EX43.5/Example43_5.sce
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+//Given that
+M = 2.71  //in g
+R = 4490  //in Bq
+fraction = 1.17/100
+Mo = 74.555  //gm/mol
+Na = 6.023*10^23  //n /mol
+
+//Sample Problem 43-5
+txt = mopen('Example43_5_result.txt','wt')
+mfprintf(txt, '**Sample Problem 43-5**\n')
+Nk = Na * M * fraction/Mo
+Th = log(2)*Nk/R
+mfprintf(txt, 'The half life of the substance is %eSec', Th)
+\ No newline at end of file