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+clc;
+// page no 545
+// prob no 15.11
+// An automobile travels at 60km/hr
+v=60*10^3/(60*60);//conversion of car's speedto m/s
+c=3*10^8;//speed of light
+//part a) calculation of time between fades if car uses a cell phone at 800*10^6Hz
+f=800*10^6;
+T=c/(2*f*v);
+disp('sec',T,'The fading period is');
+//part b) calculation of time between fades if car uses a PCS phone at 1900*10^6Hz
+f=1900*10^6;
+T=c/(2*f*v);
+disp('sec',T,'The fading period is');
+// Note that the rapidity of the fading increases with both the frequency of the transmissions and the speed of the vehicle
+\ No newline at end of file