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Px154 Revision Flashcards

(33 cards)

1
Q

What does isobaric mean and it’s associated equation?

A

At a constant pressure, W = pdV

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2
Q

What does isothermal mean and what are it’s associated equations?

A

At a constant temperature, P1V1 = P2V2, W = Q = nRT integral(dV/V)

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3
Q

What does adiabatic mean and what are the associated equations?

A

No transfer of heat, P1V1^gamma = P2V2^gamma, T1V1^(1-gamma) = T2V2^(1-gamma)

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4
Q

What does isochoric mean and it’s associated equations?

A

At a constant volume, W = 0, Q = delta U = nCv deltaT

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5
Q

What is the formula for gamma in thermodynamics?

A

CP/Cv

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6
Q

How do you tell the difference between an adiabatic process and an isothermal process on a PV diagram?

A

An adiabatic process will always have a greater pressure drop

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7
Q

At room temperature for a monatomic gas, what is gamma?

A

5/3

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8
Q

At room temperature for a diatomic gas, what is gamma?

A

7/5

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9
Q

What is the volume expansion coefficient given the linear expansion coefficient alpha?

A

3xalpha

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10
Q

What is the wave speed formula?

A

V = w/k

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11
Q

What is the wave equation?

A

d^2U/dT^2 = V^2 d^2U/dX^2

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12
Q

How is V related to tension in a string?

A

V = √(T/mu)

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13
Q

What is the work done by an isobar?

A

P deltaV

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14
Q

What is the entropy formula?

A

Integral(1/T dQ)

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15
Q

What are the units of entropy?

A

JK^-1

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16
Q

What is the first law of thermodynamics and it’s formula and differential form?

A

Energy cannot be created or destroyed, only transferred between stores.
Delta U = Q - W
dU = dQ - pdV

17
Q

What is Cv and it’s related equation?

A

The heat capacity at a constant volume
Cv = 1/n dQ/dT or 1/n dU/dT

18
Q

At room temperature, what is Cv for a monatomic and diatomic gas?

19
Q

At room temperature, what is Cp for a monatomic and diatomic gas?

20
Q

What is the coefficient of performance for a carnot engine heating and coolong a room?

A

|Qh|/W, |Qc|/W

21
Q

What is the formula for the phase speed?

22
Q

What is the formula for the group velocity?

23
Q

What are w and k in a wave equation?

A

w is the t coefficient, k is the x coefficient

24
Q

What is malus’ law?

A

I = I0 cos^2 (∅)

25
What is the formula for refractive index?
n = c/v
26
What is the formula for Carnot efficiency?
1 - Tc/Th = W/Qh = 1 - |Qc|/|Qh|
27
What is the work formula in carnot cycles?
Qh + Qc
28
What is total internal reflection and when does it occur?
When no light is transmitted to the second medium at a boundary, when light travels through a medium with a higher refractive index then the second medium behind the boundary
29
What is the critical angle?
The angle of incidence at which total internal reflection first occurs
30
For the wave expression: Acos(kx - wt)j + Acos(kx - wtf + epsilon)k What values of epsilon give circularly polarised light?
±pi/2
31
What is the transmission intensity formula?
I0 * 4*n1n2/(n1 + n2)^2
32
What is the reflected intensity formula?
I0 * (n1 - n2)^2/(n1 + n2)^2
33
When are the transmission and reflection intensity formulae relevant?
When light is incident normally to the refraction boundary