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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)`

Text Solution

Verified by Experts

The correct Answer is:
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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