Physics · Communication Systems

The vertical radio waves are totally reflected back from the ionosphere when their frequency is less than or equal to the ______.

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1cut-off frequency
2critical frequency✓
3maximum usable frequency
4lowest usable frequency

Correct answer

critical frequency

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The vertical radio waves are totally reflected back from the ionosphere when their frequency is less than or equal to the ______.

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The vertical radio waves are totally reflected back from the ionosphere when their frequency is less than or equal to the ______.

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