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+// Example No.1.1.
+// Page No.28.
+clc;clear;
+t = 0.15*10^(-2);//Thickness of the quartz crystal -[m].
+Y = 7.9* 10^(10);//Young's modulus of quartz -[N/m^2].
+d = 2650;//Density of quartz -[kg/m^3].
+f = (1/(2*t))*(sqrt(Y/d));//'f' is fndamental frequency of vibration.
+f = f*10^(-6);//fundamental frequency of vibration.
+printf("\nThe fundamental frequency of vibration of the crystal is %.4f MHz",f);
+