Physics
Isotopes of an element contain

the same number of neutrons but different number of protons
equal number of nucleons
the same number of protons but different number of neutrons
equal number of protons and electrons

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Physics
What is a compound microscope?

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

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