-- card: 29794 from stack: in
-- bmap block id: 0
-- flags: 4000
-- background id: 4601
-- name: #88
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on openCard
  global group,rightone
  put 8 into group
  put "C" into rightone
  pass openCard
end openCard



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Question #8

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3BC-2.4 What is the principal reason the 160 meter through 40 meter bands are useful for only short-distance radio communications during daylight hours?

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F-layer bending

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Gamma radiation

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D-layer absorption

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Tropospheric ducting