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-rwxr-xr-x1271/CH15/EX15.11/11.txt5
-rwxr-xr-x1271/CH15/EX15.11/example15_11.sce10
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diff --git a/1271/CH15/EX15.11/11.txt b/1271/CH15/EX15.11/11.txt
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+ # PROBLEM 11 #
+Standard formula used
+ del_E*del_t = h/(4*pi)
+
+ Minimum error in measurement of the energy is 2.107211e-21 J.
diff --git a/1271/CH15/EX15.11/example15_11.sce b/1271/CH15/EX15.11/example15_11.sce
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+clc
+// Given that
+t = 2.5e-14 // life time of hydrogen atom in exited state in sec
+h = 6.62e-34 // Planck constant in J-sec
+// Sample Problem 11 on page no. 15.28
+printf("\n # PROBLEM 11 # \n")
+printf("Standard formula used \n")
+printf(" del_E*del_t = h/(4*pi) \n")
+delta_E = h / (4 * %pi * t)
+printf("\n Minimum error in measurement of the energy is %e J.",delta_E)