Thermal & Kinetic
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Thermal & Kinetic Lecture 22 Problems Class II PowerPoint PPT Presentation


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Thermal & Kinetic Lecture 22 Problems Class II. Thermal & Kinetic paper, ’04/’05: Q1. Is it possible for the temperature of an ideal gas to rise without heat flowing into the gas?. Yes No Don’t know.

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Thermal & Kinetic Lecture 22 Problems Class II

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Thermal & Kinetic

Lecture 22

Problems Class II


Thermal & Kinetic paper, ’04/’05: Q1


Is it possible for the temperature of an ideal gas to rise without heat flowing into the gas?

  • Yes

  • No

  • Don’t know


Must the temperature of an ideal gas necessarily change as a result of hear flow into or out of it?

  • Yes

  • No

  • Don’t know


Thermal & Kinetic paper, ’02/’03: Paper 2, Q2


…compare to CW Set 4

  • Q1. 1 mole of an ideal gas originally at a pressure of 1.0 x 104 Pa and occupying a volume of 0.2 m3 undergoes the following cyclic process:

  • an adiabatic compression until the pressure is 3.0 x 104 Pa;

  • an isobaric expansion to a volume of 0.4 m3;

  • an isothermal expansion until the pressure reaches 1.0 x 104 Pa;

  • an isobaric compression to the original volume of 0.2 m3.

  • Draw a PV diagram for this process [3].

  • For each of the stages (i) – (iv) calculate the heat transferred [5], the work done [5], and the change in internal energy [5].

  • Show that only internal energy is a function of state [2].


F31ST1 CW4


Thermal & Kinetic paper, ’06/’07: Q7


What do you need to use to solve this type of PV cycle question?

  • Ideal gas law: PV = nRT

  • First law: DU = Q + W

  • Equation for adiabatic, P1V1g = P2V2g

  • Equation for adiabatic work:

  • Q = CvDT (isochoric);

  • Q = CPDT (isobaric)

  • Work done in isothermal, isobaric, isochoric process

  • Only internal energy is a function of state


Numerical answers to all (past!) exam questions are on web at:

http://www.nottingham.ac.uk/physics/intranet/undergrad/ug_numericalanswers.php


Q5. F31ST1 ’03 – ’04 Exam Paper


What is the net change in internal energy of the gas for one cycle of the engine?

  • 0 J

  • 90 J

  • 180 J

  • 60 J

  • Don’t know


When moving from point A to point B, what is the change in the volume of the gas?

  • 90 m3

  • 2 m3

  • 45 m3

  • 32 m3

  • Don’t know


Q3. F31ST1 ’06 – ’07 Exam Paper


Dimensions of Boltzmann’s constant?

  • M2L2 T2Q

  • M2L2 T2Q-1

  • M2LT-1Q-1

  • ML2 T-2Q-1

  • Don’t know


If the energy levels are spaced by 0.25 eV and the number of molecules with energy E1 is a factor of 10-5 smaller than the number with energy E0, calculate the value of T.

  • 101 K

  • 2112 K

  • 273 K

  • 252 K

  • None of these

  • Don’t know


Q2. F31ST1 ’04 – ’05 Exam Paper


How many ways are there of distributing the energy?

  • 6

  • 180

  • 10

  • 2112

  • Don’t know


What is the probability of finding the system in a state where each oscillator has one quantum of energy?

  • 50%

  • 8%

  • 10%

  • 1%

  • Don’t know


Q8(b). F31ST1 ’05 – ’06 Exam Paper


Total energy of configuration B?

  • e

  • 2e

  • 4e

  • 5e

  • Don‘t know


Q8(b). F31ST1 ’05 – ’06 Exam Paper


What is the equilbrium temperature of the system?

  • 100 C

  • 50 C

  • Neither of these

  • Don’t know


Will the total change in entropy be:

  • Positive

  • Negative

  • Zero

  • Don’t know


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