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

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Physics
What is a compound microscope?

A microscope that has one lens.
A microscope whose lenses are convex.
A microscope that has two sets of lenses : an occular lens and an eyepiece.
A microscope whose lenses are concave.

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