-- card: 32131 from stack: in
-- bmap block id: 0
-- flags: 4000
-- background id: 4601
-- name: #97
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on openCard
  global group,rightone
  put 9 into group
  put "D" into rightone
  pass openCard
end openCard



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Question #9

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3BC-6.4 What makes backscatter signals often sound distorted?

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Auroral activity and changes in the earth's magnetic field

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The propagation through ground waves that absorb much of the signal's clarity

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The earth's E-layer at the point of radio wave refration

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The small part of the signal's energy scattered back to the transmitter skip zone through several radio-wave paths