-- card: 38901 from stack: in
-- bmap block id: 0
-- flags: 0000
-- background id: 2707
-- name: #265
----- HyperTalk script -----
on openCard
  global group,rightone
  put 21 into group
  put "B" into rightone
  pass openCard
end openCard



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Question #21

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2E-12-4.2 Why do we call signals in the range 20 Hz to 20,000 Hz "audio frequencies"?

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Because the human ear rejects signals in this frequency range

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Because the human ear responds to sounds in this frequency range

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Because frequencies in this range are too low for a radio to detect

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Because a radio converts signals in this range directly to sounds the human ear responds to

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Correct answer is B