IB Physics Glossary

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Far point

is the most distant point from the eye for which the eye can focus on (assumed to be $$\infty$$).

Faraday's law

states, the induced emf is proportional to the rate of change of magnetic flux linkage:

$$\epsilon \propto \frac{\Delta \Phi}{\Delta t}$$.

First law of thermodynamics

states, $$Q = \Delta U + W$$.
Q is the heat supplied to system, $$\Delta U$$ is the change in the internal energy, W is the work done by gas, all in Joules. It is the law of conservation of energy.

a. Q > 0, heat in; Q < 0, heat out

b. $$\Delta U > 0, \Delta T > 0$$; $$\Delta U < 0, \Delta T < 0$$

c. W > 0
, work done by gas; W < 0, work done on gas.

Force field

is a region of space where masses/charges feel a force.

Forced oscillations

occur when an object is forced to oscillate by a periodic external force. (d)

Fuel enrichment

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.

Fundamental units

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).