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Biophysics > Extra Equations Not on Sheet > Flashcards

Extra Equations Not on Sheet Flashcards

1
Q

What are SI units for length?

A

Metres

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2
Q

What are SI units for mass?

A

Kilograms

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3
Q

What are SI units for time?

A

Seconds

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4
Q

What are SI units for temperature?

A

Kelvin

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5
Q

What are SI units for electrical current?

A

Ampere

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6
Q

What are SI units for substance amount?

A

Moles

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7
Q

What are SI units for charge?

A

C

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8
Q

What are SI units for resistance?

A

Ohms (special symbol) which is V/A

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9
Q

What are SI units for electrical potential difference?

A

V

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10
Q

What are SI units for equivalent dose?

A

Sv which is J/Kg

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11
Q

What are SI units for pressure?

A

Pa which is 1 N/m2

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12
Q

What are SI units for volume?

A

m3

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13
Q

What are SI units for velocity?

A

m/s

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14
Q

What are SI units for acceleration?

A

m/s2

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15
Q

What are SI units for force?

A

N

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16
Q

What are SI units for energy, work/ heat?

A

J which is N/m

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17
Q

What are SI units for power?

A

W

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18
Q

What are SI units for capacitance?

A

F which is C/V

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19
Q

What are SI units for absorbed dose?

A

Gy which is 1J/Kg

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20
Q

What are SI units for effective dose?

A

Sv which is J/Kg

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21
Q

Density

A

p = m/V

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22
Q

Gauge Pressure

A

Pg= P - Pa is actual pressure inside the vessel take atmospheric pressure

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23
Q

Tension Force

A

T + Fb = mg tension force plus buoyant force must equal the downward force

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24
Q

For every action there is an equal and opposite reaction, force is an interaction between two objects

A

Fab = Fba

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25
Q

What can you use to add vectors?

A

Tip to tail method or Pythagoras a2 + b2 = c2

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26
Q

Sedimentation

A

The net force downward is mg - Fb - D where D is the drag force due to viscosity of the fluid. Therefore increasing velocity increase drag force and slows the particle down, so bigger particles fall faster, eventually every particle reaches a terminal speed

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27
Q

Change in kinetic energy

A

deltaKE = W change in kinetic energy is work done on the object

28
Q

First, second and third class levers

A

First: Force down, fulcrum, weight (head)
Second: Force up, weight, fulcrum (foot)
Third: Weight, force up, fulcrum (arm)

29
Q

The mechanical advantage

A

R(Fp)/r (mg)= mechanical advantage, the mechanical advantage of a simple pulley is 2T = mg, you still have to exert the same force to lift the object but you are pulling instead of pushing

30
Q

The speed of an object in circular motion

A

v =2.Pi.r/T the speed of an object in circular motion is the circumference/ over the time it takes for one revolution

31
Q

No. of G’s

A

a/9.8 = the number of gravities created by the force/acceleration of the circular motion. This is used to amplify g in sedimentation (i.e. centrifuges)

32
Q

How to find elastic potential energy

A

Force over extension graph, elastic potential energy is under the line

33
Q

Boyle’s Law, pressure and volume relationship

A

P1V1 = P2V2 they are proportional when temperature is constant

34
Q

Charle’s Law, volume and temperature relationship

A

V1/V2 = T1/T2, volume of gas increases linearly with temperature for a fixed amount of gas

35
Q

Temperature, pressure and volume relationship

A

P1V1/T1 = P2V2/T2 When the volume is constant pressure is proportional to temperature

36
Q

Number of moles

A

n = M/m number of moles is mass over molar mass

37
Q

Number of atoms

A

6.022x10^23 molecules/mole

38
Q

Energy equivalence of oxygen

A

1 L of O2 is used for 20.2KJ of energy

39
Q

Osmotic pressure

A

PI = (n/v)RT no. mol. solute per volume by the universal gas constant by temperature

40
Q

1 Kcal

A

1.186 J of work

41
Q

Rate of convection

A

delta Q/ delta t = hA delta T constant h by the surface area by the temperature difference

42
Q

Internal energy of a system

A

delta U = Qin - Wout

43
Q

Isothermal process

A

delta T is zero therefore delta U is zero and the energy in is the work out

44
Q

Adiabatic process

A

Qin is zero and therefore delta U is -ve Wout

45
Q

Current

A

I = delta Q / delta t, number of charges per time

46
Q

Equilibrium Potential (Nerves)

A

Eion = RT/F .ln Ion o/ Ion i flip ions for Cl

47
Q

Nernst equation

A

Ek = 60log. Ion o/ Ion i

48
Q

Cell potential GHKE

A

Vm = RT/F .ln. pK(Ko) + pNa(Nao) + pCl(Cli) / pK(Ki) + pNa(Nai) + pCl(Clo)

49
Q

Speed of wave

A

c = lambda f which is wavelength by frequency

50
Q

Velocity of wave

A

v is proportional to lambda/T which is wavelength over time

51
Q

Doppler effect

A

I is proportional to I/r^2 Intensity of sounds diminishes with distance

52
Q

First, Second, Third harmonic open-ended
First, Third, Fifth harmonic closed one end
Closed both ends

A

Refer to sheet

53
Q

Difference between real and virtual images

A

A real image has light passing through it and a virtual image is inverted and would not show up on a piece of paper at that point, this would happen if an object is placed at a distance less than or equal to f

54
Q

Oscillations across two mediums

A

f1 = f2 frequency and oscillations must continue across a medium

55
Q

An object at the focal point or far point

A

Di appears infinite

56
Q

Combining lenses

A

1/fcom = 1/fa + 1/fb

57
Q

Mass number

A

A = N + Z X element has A top left hand and Z bottom left hand

58
Q

Protons

A

Z

59
Q

Neutrons

A

N

60
Q

Alpha decay

A

A-4 Z-2 + a an alpha particle is 2 protons and 2 neutrons

61
Q

Beta decay plus

A

Z-1Y + beta +1 + v p+ is a n B+1 + v

62
Q

Beta decay minus

A

Z+1Y + beta -1 + v n is a p+ + B-1 + v

63
Q

Gamma decay

A

Excited atom loses energy, no change to protons or neutrons

64
Q

Number of decays

A

N x probability of decay which is lambda.N.delta t

65
Q

Number of photons removed

A

delta N = -micron N0 delta t the number of photons removed is the linear attenuation coefficient by the initial no. by the delta thickness

66
Q

Radiation intensity

A

Intensity is I0 / R^2

Biophysics (2 decks)

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