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

A sky wave with a frequency `55` MHz is incident on D-region of earth's atmosphere at `45^(@)`. The angle of refraction is (electorn density for D-region is `400 "electron"//cm_(3)`)

A

`60^(@)`

B

`45^(@)`

C

`30^(@)`

D

`15^(@)`

Text Solution

Verified by Experts

The correct Answer is:
b
`n_("eff")=n_(0)sqrt(1-((80.5 N)/(v^(2))))=1sqrt(1-(80.5xx(400xx10^(6)))/((55xx10^(6))^(2)))~~1`
Also `n_("eff")=(sin i)/(sin r)implies sin r = sini impliesr=i=45^(@)`
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