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What is the range of frequency for radio...

What is the range of frequency for radio waves? 

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Radio waves lie in the range of Giga hertz (`10^(3)` Hz) to kilos hertz (`10^(3)` Hz).
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Knowledge Check

  • If f c is the critical frequency of radio waves for reflection by the ionosphere and N max is the density of free electrons in the ionosphere

    A
    `f_(c)prop N_("max")`
    B
    `f_(c)prop(1)/(N_("max"))`
    C
    `f_(c)prop(1)/sqrt(N_("max"))`
    D
    `f_(c)propsqrt(N_("max"))`

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