About how hot does something have to get to glow red hot?
A) 375 degrees F
B) 800 degrees F
C) 3000 K
D) 6000 K
Correct Answer:
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Q93: The ionosphere reflects
A)microwaves.
B)AM radio waves.
C)FM radio waves.
D)x-rays.
Q94: A coil of wire is connected to
Q95: The cosmic background radiation
A)has a blackbody spectrum.
B)has
Q96: The magnetic compass in an aircraft points
Q97: A coil of wire is connected to
Q99: Making a digital recording of a sound
Q100: A current can be made to flow
Q101: Lower frequency radio waves are reflected back
Q102: Three devices that use electromagnetic induction in
Q103: If we see two objects that have
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