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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 × 109 per m3. For the sky transmission from this layer up to a range of 250 km,
Maximum usable frequency is

A

`3.7xx10^(8) Hz`

B

`3.17 xx10^(6) Hz`

C

`4.57xx10^(6) Hz`

D

`4.57xx10^(6) Hz`

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