The ionosphere reflects __________ frequency radio waves.
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Q112: Which recording formats employ magnetism?
A)videotape
B)CD
C)DVD
D)floppy disk
Q113: A glowing blackbody that appears bluish in
Q114: The type of EM waves used in
Q115: The greenhouse effect occurs because carbon dioxide
Q116: The main form of radiation that our
Q118: The direction of a magnetic field at
Q119: Greenhouse gasses include
A)water vapor.
B)CO2.
C)CO.
D)methane.
Q120: The increase in the amount of carbon
Q121: For a body emitting blackbody radiation,the total
Q122: A coil of wire is connected to
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