1 files changed, 23 insertions, 0 deletions
diff --git a/2939/CH4/EX4.26/Ex4_26.sce b/2939/CH4/EX4.26/Ex4_26.sce
new file mode 100755
index 000000000..3efcf7bff
--- /dev/null
+++ b/2939/CH4/EX4.26/Ex4_26.sce
@@ -0,0 +1,23 @@
+
+// Ex4_26
+clc;
+
+// Given:
+t238=4.5*10^9;// in y
+t235=7.04*10^8;// in y
+a0=0.72;// atoms per cent
+t=7.04*10^8;
+// Solution:
+
+k1=0.693/(t238);//decay constant for U 238
+N1=(100-a0)*exp(k1*t);
+
+k2=0.693/(t235);//decay constant for U 235
+N2=(a0)*exp(k2*t);
+
+proportion=N2/N1;
+printf("The proportion of U235 704 million years back is %f" ,proportion)
+
+
+
+