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+
+// Scilab Code Ex3.12: Page-109 (2013)
+clc; clear
+phi = 2.93;    // Work function of lithium, eV
+c = 2.998e+008;    // Speed of light in vacuum, m/s
+K = 3.00;    // Kinetic energy of photoelectron, eV
+E = phi + K;    // Total energy of the incident light, eV
+h = 6.626e-034;    // Planck's constant, Js
+e = 1.6e-019;    // Energy equivalent of 1 eV, J
+f = E*e/h;    // Frequency of incident light, Hz
+lambda = c/f;    // Wavelength of the incident light, m
+printf("\nThe frequency of incident light = %4.2e Hz", f);
+printf("\nThe wavelength of the incident light = %4.2f nm", lambda/1e-009);
+
+// Result
+// The frequency of incident light = 1.43e+015 Hz
+// The wavelength of the incident light = 209.37 nm