Physics
The propagation of sound waves in a gas involves

Isobaric compression and rarefaction
Adiabatic compression and rarefaction
Isothermal compression and rarefaction
Isochoric compression and rarefaction

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Physics
Isotopes of an element contain

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

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