Physics
The layer of atmosphere used for radio-wave transmission is

Ionosphere
Stratosphere
Chromosphere
Troposphere

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Physics
Superconductors are those elements

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

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Physics
The mass defect is the result of what action occurring?

Energy being converted into moles of atoms when neutrons break apart protons
Mass being converted to energy when protons and neutrons break apart in a nucleus
Protons and electrons being attracted to each other
Mass being converted to energy when protons and neutrons bind together in a nucleus

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