initial commit / add all books

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+// Example 2.2.1 page 2.4

+

+clc;

+clear;

+

+alpha= 3;   // average loss     Power decreases by 50% so P(0)/P(z)= 0.5

+lamda= 900*10^-9;   //wavelength

+z= 10*log10(0.5)/alpha;   //z is the length

+z= z*-1;

+printf("The length over which power decreases by 50%% is =%.2f Kms",z);

+

+z1= 10*log10(0.25)/alpha;     //Power decreases by 75% so P(0)/P(z)= 0.25

+z1=z1*-1;   //as distance cannot be negative...

+printf("\n\nThe length over which power decreases by 75%% is =%.2f Kms",z1);