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In earth's atmosphere for F(1)-layer , t...

In earth's atmosphere for `F_(1)`-layer , the virutal height and critical frequency are

A

`150 " km and " 3 MHz`

B

` 160 " km and " 4 MHz`

C

` 170 " km and " 4.5 MHz`

D

` 180 " km and " 5 MHz`

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The correct Answer is:
D
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