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//Chapter 4, Example 4.4, page 137
clc
//Initialisation
tec=10**17 //total electron content
H=200*10**3 //thickness of F layer
//Calculation
pd=tec/H //plasma density at F
fc=9*sqrt(pd)
ouf=3.6*fc*0.8 //optimum usable frequency
muf=fc*1.788 //maximum usable frequency
//Results
printf("Maximum usable frequency = %.1f MHz",(fc*10**-6))
printf("\nOptimum usable frequency < %.3f MHz",(ouf*10**-6))
printf("\nMaximum usable frequency (30) = %.1f MHz",(muf*10**-6))
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