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What is the maximum usuable frequency (i...

What is the maximum usuable frequency (in MHz) for E-layer of atomosphere having critical frequency 4 MHz, when the angle of incidence is `60^(@)`

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The correct Answer is:
8

Here, `v_c` = 4 MHz, `anglei = 60^@`
Maximum useable frequency `= v_c sec i`
`4 xx sec 60^@ = 4xx2 = 8` MHz.
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