The maximum usable frequency of an ionospheric layer at

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The maximum usable frequency of an ionospheric layer at 60º incidence and with 8 MHz critical frequency is—

1. 16 MHz
2. 16/√3 MHz
3. 8 MHz
4. about 6.93 MHz

Correct Option: B

MUF = fc sec θ = 8 sec 60º = 16 MHz