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card_138618.txt
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1990-11-03
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951b
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38 lines
-- card: 138618 from stack: in
-- bmap block id: 0
-- flags: 4000
-- background id: 7720
-- name: #424
----- HyperTalk script -----
on openCard
global group,rightone
put 42 into group
put "D" into rightone
pass openCard
end openCard
-- part contents for background part 20
----- text -----
Question #42
-- part contents for background part 1
----- text -----
4H-6.1 What is meant by referring to electromagnetic waves travel in free space?
-- part contents for background part 11
----- text -----
The electric and magnetic fields eventually become aligned
-- part contents for background part 27
----- text -----
Propagation in a medium with a high refractive index
-- part contents for background part 28
----- text -----
The electromagnetic wave encounters the ionosphere and returns to its source
-- part contents for background part 29
----- text -----
Propagation of energy across a vacuum by changing electric and magnetic fields