Physics
Isotopes of an element contain

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

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Physics
Analog synthesis refers to a technology based on

Representing data in terms of measurable physical quantities.
Interfacing synthesizer equipment.
Representing physical quantities as numbers.
Placing brief digital recordings of live sounds under the control of a synthesizer keyboard.

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