Physics
In radio-communication, the signals emitted by transmitting antenna are reflected on

Ozonosphere
Stratosphere
Ionosphere
Troposphere

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

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

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