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A space capsule making a reentry into the earth`s atmospheresuffers a communications blackout because a plasma is generated by theshock wave in front of the

A space capsule making a reentry into the earth`s atmospheresuffers a communications blackout because a plasma is generated by theshock wave in front of the capsule. If the radio operates at a frequency of300MHz, what is the minimum plasma density during the blackout?(Exercice 4.9, Chapter 4 of Chen`s book).

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