-- card: 35418 from stack: in
-- bmap block id: 0
-- flags: 4000
-- background id: 4601
-- name: #116
----- HyperTalk script -----
on openCard
  global group,rightone
  put 10 into group
  put "A" into rightone
  pass openCard
end openCard



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Question #116

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T3B09  What happens to signals higher in frequency than the critical frequency?

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They pass through the ionosphere

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They are absorbed by the ionosphere

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Their frequency is changed by the ionosphere to be below the maximum usable frequency

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They are reflected back to their source

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Correct answer is A