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For skywave propagation of a 10 MHz sign...

For skywave propagation of a 10 MHz signal, what should be the minimum electron density in ionosphere

A

`1.23 xx 10^(10) m^(-3)`

B

`1.23 xx 10^(12) m^(-3)`

C

`1.23 xx 10^(11) m^(-3)`

D

`12.3 xx 10^(10) m^(-3)`

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