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-rwxr-xr-x1271/CH15/EX15.12/12.txt5
-rwxr-xr-x1271/CH15/EX15.12/example15_12.sce10
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diff --git a/1271/CH15/EX15.12/12.txt b/1271/CH15/EX15.12/12.txt
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+# PROBLEM 12 #
+Standard formula used
+ del_E*del_t = h/(4*pi)
+
+ Minimum uncertainty in frequency is 7.957747e+06 Hz.
diff --git a/1271/CH15/EX15.12/example15_12.sce b/1271/CH15/EX15.12/example15_12.sce
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index 000000000..783568c12
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+clc
+// Given that
+t = 10^-8 // life time of atom in exited state in sec
+h = 6.62e-34 // Planck constant in J-sec
+// Sample Problem 12 on page no. 15.28
+printf("\n # PROBLEM 12 # \n")
+printf("Standard formula used \n")
+printf(" del_E*del_t = h/(4*pi) \n")
+delta_f = 1 / (4 * %pi * t)
+printf("\n Minimum uncertainty in frequency is %e Hz.",delta_f)