Physics
Which of the following principle is used to produce ''low-temperatures' ?

Super conductivity
Joule-Kelvin effect
Adiabatic demagnetisation
Thermo-electric effect

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Physics
Isotopes of an element contain

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

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