1.

For sky wave propagation of 10 MHz signal, what should be the minimum electron density in ionosphere?

Answer»

`~10^(14)m^(-3)`
`~10^(6)m^(-3)`
`~1.2^(12)m^(-3)`
`~10^(22)m^(-3)`

Solution :The crtical frequency of SKY WAVE undergoing reflection from a layer of atmosphere is
`f_(c)=SQRT(N_(max))`
Where `N` is electron density per `m^(3)`
`:. N_(max)=(f_(c)^(2))/81=((10xx10^(6))^(2))/81`
`=1.2xx10^(12) m^(-3)`


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