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Which of the following frequency is greater than the critical frequency?

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Which of the following frequency is greater than the critical frequency?

(a) MUF

(b) LUF

(c) Optimum frequency

(d) VLF
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The correct choice is (a) MUF

The explanation is: According to the secant law, fMUF=fc secθi

So MUF is greater than or equal to the critical frequency depending on the secθi
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