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Consider a system of two Einstein solids, Aand B, each containing 10 oscillators, sharing a total of 20units of energy. Assume that the solids are weakly coupled, and that the total energy is fixed.

(a) How many different macro states are available to this system?

(b) How many different microstates are available to this system?

(c) Assuming that this system is in thermal equilibrium, what is the probability of finding all the energy in solid A?

(d) What is the probability of finding exactly half of the energy in solid A?

(e) Under what circumstances would this system exhibit irreversible behavior?

Short Answer

Expert verified

a) The macro states are available to the current system is 21macrostates

b) The micro states are available to the present system is overall=6.8921010

c) The probability of finding all the energy in solid A is P=1.45310-4

d) The probability of finding exactly half of the energy in solid A is P=0.1238

Step by step solution

01

macro and micro states (a) and (b)

Assume they're two Einstein physics structures, Aand B, with NA=NB=10and qA+qB=20..

(a) As a metric, the count of macro states is:

q+1=20+1=21

because we began with 0 and switch our attention resolute 20.

(b) The formula for said length of microstates is:

overallNoverall,qoverall=qoverall+Noverall1qoverall=qoverall+Noverall1!qoverall!Noverall1!

qoverall=qA+qB=20,

Noverall=NA+NB

overall=20+20120

=(20+201)!20!(201)!

=6.8921010

overall=6.8921010

02

Equilibrium (c)

(c)The likelihood that while in equilibrium state, most of the facility is in rigid A, resulted in:

qA=20qB=0NA=10NB=10

The cumulative number is calculated based:

total=AB

A=qA+NA1qA=qA+NA1!qA!NA1!

A=20+10120=(20+101)!20!(101)!=10015005

B=qB+NB1qB=qB+NB1!qB3!NB1!

B=0+1010=(0+101)!0!(101)!=1

total=AB=100150051=10015005

As an answer, this same chances inside this instance is:

localid="1650298575703" P=totaloverall

localid="1650298609352" =100150056.8921010

localid="1650298489904" =1.453104

03

Evenly Distributed (d)

(d)The likelihood that while in equilibrium state, most of the power is in rigid , resulted in:

qA=10qB=10NA=10NB=10

The cumulative number is calculated based:

total=AB

localid="1650382124449" A=qA+NA1qA=qA+NA1!qA!NA1!

A=20+10120=(10+101)!10!(101)!=92378

B=qB+NB1qB=qB+NB1!qB3!NB1!

B=0+1010=(10+101)!10!(101)!=92378

As a solution, this same chances inside this instance is:

P=totaloverall

=8.53371096.8921010

=0.1238

04

Equally Distributed (e)

(e) it'll be more likely that it photon energy will spread them divided between the 2 solids, and when that does, it's rare that its position will revert about one solid having similar more quanta than others. That is, an irreversible state is that the one where the quanta are spaced equally.

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Most popular questions from this chapter

Rather than insisting that all the molecules be in the left half of a container, suppose we only require that they be in the leftmost 99%(leaving the remaining 1%completely empty). What is the probability of finding such an arrangement if there are 100molecules in the container? What if there are 10,000molecules? What if there are 1023?

Use the Sackur-Tetrode equation to calculate the entropy of a mole of argon gas at room temperature and atmospheric pressure. Why is the entropy greater than that of a mole of helium under the same conditions?

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Check that this expression reduces to the one given in the text whenx=1/2 .

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(a) Use Stirling's approximation to estimate the height of the peak in the multiplicity function.

(b) Use the methods of this section to derive a formula for the multiplicity function in the vicinity of the peak, in terms of xN(N/2). Check that your formula agrees with your answer to part (a) when x=0.

(c) How wide is the peak in the multiplicity function?

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