# AS GCE (H157) A GCE (H557) Physics B (Advancing Physics) Data Formulae · PDF file 2019-05-11 · GCE in Physics B (Advancing Physics) (H157) or the Advanced GCE in Physics B (Advancing

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Oxford Cambridge and RSA

The information in this booklet is for the use of candidates following the Advanced Subsidiary GCE in Physics B (Advancing Physics) (H157) or the Advanced GCE in Physics B (Advancing Physics) (H557) course. The data, formulae and relationships in this datasheet will be printed for distribution with the examination papers. Copies of this booklet may be used for teaching. This document consists of 8 pages.

Data, Formulae and Relationships Booklet

CST990

Instructions to Exams Officer/Invigilator • Do not send this Data Sheet for marking; it should be retained in the centre or

destroyed.

* 7 3 5 4 4 9 7 9 3 0 *

Physics B

• 2

2

Data, Formulae and Relationships

Data

Values are given to three significant figures, except where more – or fewer – are useful.

Physical constants

speed of light c 3.00 × 108 m s-1

permittivity of free space ε0 8.85 × 10-12 C2 N-1 m-2 (or F m-1)

electric force constant 04

1 ε

k π

= 8.98 × 109 N m2 C-2 (≈ 9 × 109 N m2 C-2)

permeability of free space µ0 4π × 10-7 N A-2 (or H m-1)

charge on electron e –1.60 × 10-19 C

mass of electron me 9.11 × 10-31 kg = 0.000 55 u

mass of proton mp 1.673 × 10-27 kg = 1.007 3 u

mass of neutron mn 1.675 × 10-27 kg = 1.008 7 u

mass of alpha particle mα 6.646 × 10-27 kg = 4.001 5 u

Avogadro constant L, NA 6.02 × 1023 mol-1

Planck constant h 6.63 × 10-34 J s

Boltzmann constant k 1.38 × 10-23 J K-1

molar gas constant R 8.31 J mol-1 K-1

gravitational force constant G 6.67 × 10-11 N m2 kg-2

• 3

3

Other data

standard temperature and pressure (stp) 273 K (0 °C), 1.01 × 105 Pa (1 atmosphere)

molar volume of a gas at stp Vm 2.24 × 10-2 m3

gravitational field strength at the Earth’s surface in the UK

g 9.81 N kg-1

Conversion factors

unified atomic mass unit 1u = 1.661 × 10-27 kg

1 day = 8.64 × 104 s

1 year ≈ 3.16 × 107 s

1 light year

≈ 1016 m

Mathematical constants and equations

e = 2.72 π = 3.14 1 radian = 57.3°

arc = rθ circumference of circle = 2πr

sinθ ≈ tan θ ≈ θ and cos θ ≈ 1 for small θ area of circle = πr

2

surface area of cylinder = 2πrh

ln(xn) = n lnx volume of cylinder = πr2h

ln(ekx) = kx surface area of sphere = 4πr2

volume of sphere = 33 4 rπ

Prefixes

10-12 p

10-9 n

10-6 µ

10-3 m

103 k

106 M

109 G

• 4

4

Formulae and relationships

Imaging and signalling

focal length fuv 111

+=

linear magnification u vm =

refractive index 1st medium 2nd medium

sin sin

cin r c

= =

noise limitation on maximum bits per sample b = log2   

  

noise

total

V V

alternatives, N, provided by n bits N = 2b, b = log2N

Electricity

current t QI ∆ ∆

=

potential difference Q WV =

power and energy P = IV = I2R, W=VIt

e.m.f and potential difference V = ℰ – Ir

conductors in series and parallel ...++= 21

111 GGG

G = G1 + G2 + ...

resistors in series and parallel R = R1 + R2 + ... ...++= 21

111 RRR

potential divider inout VRR R

V 21

2

+ =

conductivity and resistivity L AG σ=

A LR ρ=

capacitance V QC =

energy stored in a capacitor E = 2 1 QV = 2

1 CV2

discharge of capacitor d d Q Q t RC = − Q = Q0 e -t/RC τ = RC

• 5

5

Materials

Hooke’s law F = kx

elastic strain energy 2 1 kx2

Young modulus strain stress

=E , areasectional-cross

tension stress = ,

lengthoriginal extension strain =

Gases

kinetic theory of gases 23 1 cNmpV =

ideal gas equation pV = nRT = NkT

Motion and forces

momentum p = mv

impulse F∆t

force F = t

mv Δ

Δ )(

work done W = Fx ∆E = F∆s

power P = Fv, P = t E∆

components of a vector in two perpendicular directions

equations for uniformly accelerated motion = +

= +

= +

21 2

2 2 2

s ut at v u at v u as

for circular motion r

va 2

= , r

mvF 2

= = mrω2

Fsinθ F

Fcosθ θ

• 6

6

Energy and thermal effects

energy ∆E = mc∆θ

average energy approximation average energy ~ kT

Boltzmann factor E kTe

Waves

wave formula v = f λ

frequency and period T

f 1=

diffraction grating nλ = dsinθ

Oscillations

simple harmonic motion xx m ka

dt xd 2 2

2 ω−=

 

  −==

x = A cos (ωt)

x = A sin (ωt)

ω = 2πf

Periodic time k mT π= 2

g LT π= 2

total energy E = 2 1 kA2 = 2

1 mv2 + 2 1 kx2

Atomic and nuclear physics

−= teNN λ0 −=

half life λ

T ln2 2 1 =

radioactive dose and risk absorbed dose = energy deposited per unit mass

effective dose = absorbed dose x quality factor

risk = probability × consequence

mass–energy relationship Erest = mc2

• 7

7

relativistic factor 221 1

c/v γ

− =

relativistic energy Etotal = γErest

energy–frequency relationship for photons E = hf

de Broglie p hλ =

Field and potential

for all fields r V

r V

Δ Δ

d dstrengthfield −≈−=

gravitational fields m Fg = , grav

GmME r

= −

r GMVgrav −= , 2r

GmMF −=

electric fields d V

q FE == , electrical potential energy

r kQq

=

r kQVelectric = , 2r

kQqF =

Electromagnetism

magnetic flux Φ = BA

force on a current carrying conductor LBIF =

force on a moving charge F = qvB

Induced e.m.f ℰ = − dt

)ΦNd(

• 8

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