Physics
One nanometer is equal to ________ meters.

10 raised to the power (-12)
10 raised to the power (-9)
10 raised to the power (-6)
10 raised to the power (-3)

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Physics
Superconductors are those elements

Which turn into insulators at very low temperatures
Whose conductivity is intermediate between metals and insulators
Which conduct electricity only at super-high temperatures
Whose resistance falls almost to zero at very low temperatures

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