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// Chapter 6 example 16
//------------------------------------------------------------------------------
clc;
clear;
// Given data
h = 6.63*10^-34; // planck's constant in Joule-sec
el = 0.25; // lower energy level in eV from energy level diag.
eh = 1.5; // higher energy level in eV from energy level diag.
e = 1.6*10^-19; // charge of electron
c = 3*10^8; // vel. of light in m/s
// calculations
hf = (eh - el)*e // energy diff b/w two levels in J
f = hf/h; // frequency
lamda = c/f // o/p laser wavelength in m
// Output
mprintf('Output laser wavelength = %3.0e m or%3.0f µm ',lamda,lamda*10^6)
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