IB Physics Glossary
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Chandrasekhar core limit
equals 1.4 solar masses for the core of a (super) red giant.
Low mass stars: core mass < 1.4 solar masses
Red giant -> Planetary nebula -> White dwarf
Helium burns and fuses in the core into carbon and oxygen.
High mass stars: core mass > 1.4 solar masses
Super Red Giant -> Supernova -> Neutron star or Black Hole
Silicon burns and fuses in the core into iron.
Coefiicient of voume expansion
a. highly elliptical orbits;
b. large orbital radii beyond planets;
c. orbit are in many different planes. (d)
Conductive hearing loss
occurs when the air conduction thresholds (middle ear) show a hearing loss but the bone conduction thresholds (cochlea) are normal. Reasons include
A material that allows the flow of electric charge through it.
Conduction is the flow of charge (free electrons) from atom to atom within a material.
is a pattern of stars, as seen from Earth, which are not close to one another in space. (d)
is the density which produces a flat universe. In a flat universe the rate of expansion of the universe gradually slows down, asymptotically approaching a zero rate of expansion. (d)