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A sky wave with a frequency 55 MHz is in...

A sky wave with a frequency 55 MHz is incidenet on D-region of earth's atmosphere at `45^(@)`, The angle of refraction is (electron density for D-region is 400 electron/c.c.

A

`60^(@)`

B

`45^(@)`

C

`30^(@)`

D

`15^(@)`

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The correct Answer is:
B
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