For sky wave propagation of 10 MHz signal. What should be the minimum electron density in the ionosphere

For sky wave propagation of 10 MHz signal. What should be the minimum

1.	For sky wave propagation of 10 MHz signal. What should be the minimum electron density in the ionosphere
Answer» `10^(12)//m^(3)` `10^(6)//m^(3)` `10^(9)//m^(3)` `10^(14)//m^(3)` ANSWER :A

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For sky wave propagation of 10 MHz signal. What should be the minimum electron density in the ionosphere

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