1.

Find out the maximum electron density of the ionosphere if the maximum frequency of the radiowaves which returns to the earth after reflecting from the ionosphere is 18 MHz.A. `8m^(-3)`B. `6m^(-3)`C. `4 m^(-8)`D. `2 m^(-3)`

Answer» Correct Answer - C
Given , critical frequency ` (f_(c))=18MHz ` maximum electron density `(N_("max "))=?`
As we know that ` f_(c)=9(N_("max")=?`
`implies 18=9(N_("max"))^(1//2)`
` or N_("max")=[(18)/(9)]^(2) or N_("max")=4m^(-3)`


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