1 files changed, 18 insertions, 0 deletions
diff --git a/2795/CH5/EX5.12/Ex5_12.sce b/2795/CH5/EX5.12/Ex5_12.sce
new file mode 100755
index 000000000..6068e164a
--- /dev/null
+++ b/2795/CH5/EX5.12/Ex5_12.sce
@@ -0,0 +1,18 @@
+// Scilab Code Ex5.12 : Page-190 (2014)
+clc; clear;
+c = 3e+8;    // Speed of light, m/s
+dt = 1e-08;    // Relaxation time of atom, s
+h = 6.6e-34;    // Planck's constant, Js
+dE = h/(4*%pi*dt);    // Energy width of excited state of atom, J
+lambda = 300e-009;    // Wavelegth of emitted photon, m
+f = c/lambda;    // Frequency of emitted photon, per sec
+printf("\nThe energy width of excited state of the atom = %3.1e eV", dE/1.6e-019);
+df = dE/h;    // Uncertainty in frequency, per sec
+printf("\nThe uncertainty ratio of the frequency = %1.0e",  df/f);
+
+// Result
+// The energy width of excited state of the atom = 3.3e-008 eV
+// The uncertainty ratio of the frequency = 8e-009 
+
+
+