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PHY1 ­ AQA GCE Physics A Unit 1 ­ Revision notes

Page 2

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Chapter 1 ­ Base Physics! 4

Base units:! 4

Derived units:! 4

Prefixes:! 4

Chapter 2 ­ Particles! 5

The Atom:! 5

Specific charge:! 5

Strong nuclear force:! 5

Unstable nuclei:! 5

Alpha decay:! 5

­ decay:! 5

Photons ­ particles of light:! 6

Antimatter:! 6

Annihilation:! 6

Pair production:!…

Page 3

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Fluorescent tubes:! 13

NB:! 13

Chapter 4 ­ Electricity! 14

Current and charge:! 14

EMF and potential difference:! 14

Circuit rules:! 14

Variation of current and potential difference:! 14

Resistivity:! 15

Resistivity of metals and superconductors:! 15

Superconductors:! 16

Resistors in series and parallel:! 16

Electrical energy and power:! 16…

Page 4

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Chapter 1 ­ Base Physics

Chapter 1 ­ Base Physics
Base units:
· International system of units (SI system) is based on 7 fundamental units:
Basic Quantity Unit Symbol

Mass Kilogram kg

Length Metre m

Time Second s

Electric current Ampere A

Temperature Kelvin K

Amount of substance Mole mol…

Page 5

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Chapter 2 ­ Particles

Chapter 2 ­ Particles

The Atom:
· Protons and neutrons are referred to as nucleons.
Particle Relative mass Relative Charge Mass / kg Charge / C

Proton 1 +1 +1.67 x 10-16
1.67 x 10-27
Neutron 1 0 0

Electron 0.00005 -1 9.11 x 10-31 -1.67…

Page 6

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Chapter 2 ­ Particles

· It is also found that the range of energies released in ­ decay can only be explained if another particle is emitted
in addition to the electron. This particle has no charge and negligible mass (hence very hard to detect). It is called
the antineutrino,…

Page 7

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Chapter 2 ­ Particles

Pair production:
· Pair production is the opposite process to annihilation i.e. the creation of a particle and an antiparticle usually
from the energy of a proton.
· E.g. e­ + e+
· This is only possible if the photon has sufficient energy to provide at…

Page 8

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Chapter 2 ­ Particles

· Baryon number:
· All quarks have a baryon no. of + and all antiquarks of -.
· Therefore:
· All baryons have baryon number +1.
· All anti-baryons have baryon no. -1.
· All mesons have baryon no. 0.
· All leptons have baryon no.…

Page 9

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Chapter 2 ­ Particles

Feynman Diagrams:
· Richard Feynman devised a shorthand way of describing particle interactions called Feynman diagrams.
· Particles are represented by straight lines with arrows on. The precise directions of the lines are not significant
and do not show the directions of the particles.
· Exchange…

Page 10

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Chapter 2 ­ Particles

· Electron capture:
· One of the innermost electrons in an atom travels very close to the nucleus and interacts with a proton by the
weak force.
· e.g. 3718Ar + 0-1e­ 3717Cl + 00ve
· i.e. p + e­ n + ve
· The electron…

Comments

Ryan.P

Hey these are really! :D Do you have any for Unit 2? 

Narghas

wow!!!! Do you have unit 2 ?

Agne

These are really good!! Do you have any Unit 2 notes

Miss Meera J

UNIT 2 PLS !!!!!!!

GINGERNINJAtjm

These are perfect, if you have any for unit 2, please upload. Because, as I said, these are perfect!!!!

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