-- card: 98982 from stack: in
-- bmap block id: 0
-- flags: 4000
-- background id: 4601
-- name: #117
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on openCard
  global group,rightone
  put 10 into group
  put "C" into rightone
  pass openCard
end openCard



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Question #117

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T3B10  What causes the maximum usable frequency to vary?

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The temperature of the ionosphere

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The speed of the winds in the upper atmosphere

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The amount of radiation received from the sun, mainly ultraviolet

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The type of weather just below the ionosphere

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Correct answer is C