7. Now suppose that the box contains 1023 gas molecules. Use your formula to calculate the probability of finding all of the molecules on the right side of the box. Realistically, would you ever expect to see this happen?

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Chapter31: Radioactivity And Nuclear Physics
Section: Chapter Questions
Problem 3PE: (a) Repeat Exercise 31.2, and convert the energy to joules or calories. (b) If all of this energy is...
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Activity 1: Counting Microstates and Calculating Probabilities
If there is only one molecule of gas in the system (N=1), then there are 2 possible microstates for
the system. If N=2, there are 4 possible microstates. This becomes easy to see if you think of all
the possible ways to arrange the molecules and draw a diagram of each one, as shown below.
N = 1
N = 2
1. In the space below, draw a sketch of all possible microstates for N = 3. Use different shapes
or different colors so you can tell the particles apart. You should work it out on scratch paper
first. What is the total number of microstates?
N= 3
2. In the space below, draw a sketch of all possible microstates for N = 4. What is the total
number of microstates?
24 = 16
..
Transcribed Image Text:Activity 1: Counting Microstates and Calculating Probabilities If there is only one molecule of gas in the system (N=1), then there are 2 possible microstates for the system. If N=2, there are 4 possible microstates. This becomes easy to see if you think of all the possible ways to arrange the molecules and draw a diagram of each one, as shown below. N = 1 N = 2 1. In the space below, draw a sketch of all possible microstates for N = 3. Use different shapes or different colors so you can tell the particles apart. You should work it out on scratch paper first. What is the total number of microstates? N= 3 2. In the space below, draw a sketch of all possible microstates for N = 4. What is the total number of microstates? 24 = 16 ..
3. Can you see a pattern emerging? Come up with a general formula for the total number of
microstates for a system of N gas molecules. The only variable in your formula should be N.
n=2N
4. For each case we've sketched out (N = 1 to N = 4), how many microstates are there with all
of the particles on the right side of the box? Does your answer depend on N?
number of microstates with all molecules on the right side of the box =
Does your answer depend on the number of molecules of gas in the system? Y/N
5. Write down the formula for the probability of finding all of the gas molecules on the right
side of the box. Read the introduction section again if you're not sure how to do this. The
only variable in your formula should be N.
6. Suppose that the box contains 4 molecules. Use your formula to calculate the probability of
finding all of the molecules on the right side of the box.
.0625
16
24
7. Now suppose that the box contains 1023 gas molecules. Use your formula to calculate the
probability of finding all of the molecules on the right side of the box. Realistically, would
you ever expect to see this happen?
Transcribed Image Text:3. Can you see a pattern emerging? Come up with a general formula for the total number of microstates for a system of N gas molecules. The only variable in your formula should be N. n=2N 4. For each case we've sketched out (N = 1 to N = 4), how many microstates are there with all of the particles on the right side of the box? Does your answer depend on N? number of microstates with all molecules on the right side of the box = Does your answer depend on the number of molecules of gas in the system? Y/N 5. Write down the formula for the probability of finding all of the gas molecules on the right side of the box. Read the introduction section again if you're not sure how to do this. The only variable in your formula should be N. 6. Suppose that the box contains 4 molecules. Use your formula to calculate the probability of finding all of the molecules on the right side of the box. .0625 16 24 7. Now suppose that the box contains 1023 gas molecules. Use your formula to calculate the probability of finding all of the molecules on the right side of the box. Realistically, would you ever expect to see this happen?
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