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# Mean Free Path & surplus Uranium

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(g) Deﬁne the 'mean free path' for a neutron in a material.
Water is used as the moderator in a PWR. Calculate the mean free path of a thermal neutron in water given that the absorption cross section for thermal neutrons in water is o = 0.66 barns.
What are the consequences for the spacing of the fuel rods in a PWR?
(Please see the attachment for the rest of the information.)

(h) A breeder reactor operates at a rating of 500 MW per tonne of 233U.
What other element is required for the production of 233U in the breeding process?
If the breeding ratio B = 1.16, and the reactor is run for 10 years, calculate how much surplus 233U is produced per tonne of 233U consumed assuming an energy release of 200 MeV per fission.

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https://brainmass.com/physics/atoms-molecules/mean-free-path-surplus-uranium-542214

#### Solution Preview

(g)
The mean free path is the average distance travelled by a moving particle between successive collisions which modify its direction or energy or other particle properties.
Mean free path,
lambda = 1/(N*sigma)
cross-section, sigma = 0.66 barns == 0.66*10^(-28) m^2
N = atomic density == molecules or atoms/volum
For water, N = density of ...

#### Solution Summary

In first question, mean free path for thermal neutrons in water is estimated. In second question, surplus uranium produced in a breeder reactor is estimated.

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## Imagine you are going on a 6 month expedition to a foreign country to experience the diversity of this country

Imagine you are going on a 6 month expedition to a foreign country to experience the diversity of this country.

While you are there, you will journal your experiences and then write an article that will be published in a travel magazine.

Choose a foreign country in which there has been well-documented instances of discrimination against certain races such as:
India: the Dalits and Adivasis; Bosnia: The Muslims and Croats; South Africa: The Coloured's or Black Africans; Indonesia: The Chines; Rwanda: The Batwa.

Write an article for the travel magazine with a focus on the impact prejudice and discrimination on various cultures within the country you've chosen to visit. Cite 3-5 sources.

Include the following in your article:

1. A description of the various cultures as well as the races and ethnicities that exist within the country.
2. A clear differentiation between race and ethnicity
3. Examples of discrimination against a culture, race, or ethnic group in this country and an explanation of why the discrimination exists.
4. A description of the ways the discrimination has affected the people of this country and conditions that have resulted from the discrimination such as segregation, political unrest, poverty, or war.

Please help me with this I don't know where to start I am overwhelmed. Any help will be much appreciated. Thank you.

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