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Physics > Topic Six - Thermal Physics > Flashcards

Topic Six - Thermal Physics Flashcards

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1
Q

What is internal energy?

A

The sum of the kinetic and potential energy in a body

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2
Q

How would you increase the internal energy?

A
  • increase the work done on the body
  • transfer energy by heating
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3
Q

What is the first law of thermal dynamics?

A

The change of internal energy = to total energy transfer due to work done + heating

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4
Q

What is specific heat capacity?

A

The energy needed to raise the temperature of 1KG by 1 K

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5
Q

What is meant by continuous flow?

A

Energy is only used when heat is needed

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6
Q

How can you work out the specific heat capacity of a fluid?

A

Using a continuous-flow calorimeter:
- fluid flows continuously over a heating element
- assumption: heat transferred from apparatus to surrounding = constant
- change in time = constant
- flow rate + p.d. = changed
- E supplied to liquid: IVt = mcT

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7
Q

What is the specific latent heat of fusion?

A
  • The heat needed to change a unit of mass of substance
  • from solid to liquid
  • without a change in temperature
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8
Q

What is the specific latent heat of vaporisation?

A
  • The heat needed to change a unit of mass of substance
  • from liquid to vapour
  • without a change in temperature
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9
Q

What is sublimation?

A

Solid -> vapour

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10
Q

What is an Ideal Gas?

A
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11
Q

What is the pressure in a gas?

A

The force per unit area

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12
Q

What is boyles law?

A

P is indirectly proportional with V
pV = k

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13
Q

What is Charles law?

A

V is proportional to T
V/T = k

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14
Q

What is the pressure law?

A

P is proportional to T
P/T = k

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15
Q

What is an isothermal change?

A

A change that occurs under constant temperature

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16
Q

What is an isobaric change?

A

A change that happens under constant pressure

17
Q

What is absolute zero?

A
18
Q

How do you find work done?

A

W = Fs = pV

19
Q

What is the formula for number of particles?

A

N= n x Na
No. Of particles = moles x avagadros constant

20
Q

How do you work out moles?

A

N = mass/ molar mass

21
Q

How do you work out molar mass?

A

Molar mass = molecular mass x Na

22
Q

What is Brownian motion?

A
23
Q

What are the assumptions of an ideal gas?

A
  • no intermolecular forces between molecules
  • motion is continuous
  • all collisions are elastic
  • duration of collision time = negligible compared to time between impacts
24
Q

How do you derive pV = 1/3 Nm (Crms)^2

A
25
Q

What is the change in momentum?

A

Physics (10 decks)

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