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The electron density of a layer of ionos...

The electron density of a layer of ionosphere at a height 150 km from the earth's surface is `9 xx 10^9` per `m^3`. For the sky transmission from this layer up to a range of 250 km,
Maximum usable frequency is

A

3.17 Hz

B

`3.17xx10^(6)Hz`

C

`3.17xx10^(3)Hz`

D

`3.17xx10^(10)Hz`

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