Physics Additional Notes Edexcel

Physics Additional (P2)Static Electricity

Uses:

ResistanceWhy do appliances heat up?

LDR and Thermistors

Voltage current graphs

Distance and velocity time graphs

If the line becomes negative, this means the object is returning to its start position

RadioactivityRadioisotopesA radioisotope is an unstable isotope (An atom of an element with the same number of protons but different a number neutrons e.g. C-12 and C-14). These radioisotopes eject matter from their nucleus in order to gain stability. There are 3 things that they can eject from their nucleus:

How do radiations ionise atoms?

Nuclear Fission and FusionFission

How fission can be controlled:

Fusion

Nuclear Power stations

Positives and negatives

Background Radiation

Half-lifeThe time taken for half of the undecayed radioisotopes in a sample to decay.

Half-life can be measured in Becquerels:

Carbon DatingCarbon dating uses half-life to work out the age of a fossil