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diff --git a/3547/CH3/EX3.2/3_2.jpg b/3547/CH3/EX3.2/3_2.jpg Binary files differnew file mode 100644 index 000000000..b432fd09d --- /dev/null +++ b/3547/CH3/EX3.2/3_2.jpg diff --git a/3547/CH3/EX3.2/Ex3_2.sce b/3547/CH3/EX3.2/Ex3_2.sce new file mode 100644 index 000000000..6bded7fa6 --- /dev/null +++ b/3547/CH3/EX3.2/Ex3_2.sce @@ -0,0 +1,49 @@ +// Example no. 3.2
+// To calculate (a) the wavelength of light emitted, (b) the ratio of spontaneous emission rate to stimulated emission rate, (c) the ratio of stimulated emission rate to absorption rate, and (d) the population density of the excited level.
+// Page no. 100
+
+clc;
+clear;
+
+// Given data
+deltaE=1.26*10^-19; // The energy difference between two levels
+h=1.054*10^(-34); // The distance between two levels
+c=3*10^8; // The speed of ligth in m/s
+kB=1.38*10^(-23); // The Boltzmann’s constant J/K
+T=300; // The absolute temperature in Kelvin
+N1=10^19; // The population density in the ground state in cm^(-3)
+
+// (a)The wavelength of light emitted
+h=2*%pi*h; // The distance between two levels in J.s
+f=deltaE/h; // The frequency in Hz
+lambda=(c/f)*10^6; // The wavelength of ligth emitted in micrometer
+
+// Displaying the result in command window
+printf('\n The wavelength of ligth emitted = %0.2f micrometer',lambda);
+
+// The calculation of this answer is wrong in the book
+
+// (b)The ratio of spontaneous emission rate to stimulated emission rate
+RspRst=(exp(deltaE/(kB*T))-1); // The ratio of spontaneous emission rate to stimulated emission rate
+
+// Displaying the result in command window
+printf('\n The ratio of spontaneous emission rate to stimulated emission rate = %0.2f X 10^13',RspRst*10^-13);
+
+// The calculation of this answer is wrong in the book
+
+// (c)The ratio of stimulated emission rate to absorption rate
+RstRab=(exp(-deltaE/(kB*T))); // The ratio of stimulated emission rate to absorption rate
+
+// Displaying the result in command window
+printf('\n The ratio of stimulated emission rate to absorption rate = %0.2f X 10^-14',RstRab*10^14);
+
+// The calculation of this answer is wrong in the book
+
+// (d)The population density of the excited level
+N2=(N1*exp(-deltaE/(kB*T))); // The population density of the excited level in cm^(-3)
+
+// Displaying the result in command window
+printf('\n The population density of the excited level = %0.2f X 10^5 cm^(-3)',N2*10^-5);
+
+// The calculation of this answer is wrong in the book
+
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