IB Physics Glossary
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First law of thermodynamics
is a region of space where masses/charges feel a force.
occur when an object is forced to oscillate by a periodic external force. (d)
Enrichment is the process by which the isotopic composition of a nuclear fuel is increased to make nuclear fissions more likely. Typically, uranium fuel rods are enriched, via neutron bombardment, to ensure that the percentage content of uranium-235 is increased.
are the most basic units which cannot be expressed in terms of other units. The seven fundamental units are
1. meter (m);
2. second (s);
3. kilogram (kg);
4. Kelvin (K);
5. The Ampere (A);
6. mole (mol);
7. candela (cd).
g versus E
is a collection of galaxies grouped together due to the gravitational attraction between them. (d)
is a group of galactic clusters. (d)
is a large group of stars gravitationally bound together (approx. 1010 stars, diameter 105 ly). (d)