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Question: a radio wave from outer space passes through the terrestrial...

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A radio wave from outer space passes through the terrestrial ionosphere on its way to Earth. If the electron density is N 1012 1/m3, below what frequency can we no longer receive signals? If the ionosphere were 100 km thick and f10 MHz, what would be the group delay T (seconds) of signals passing through it relative to the delay To over the same path if N were zero?

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