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What is enriched uranium? a. U-238 ...

What is enriched uranium?
a. `U-238` b. `U-235`
c. `U-235 +` Radium d. `U-235 + U-238`

A

a. `U-238`

B

b. `U-235`

C

c. `U-235 +` Radium

D

d. `U-235 + U-238`

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question "What is enriched uranium?", we need to analyze the options provided and understand the concept of enriched uranium. ### Step-by-Step Solution: 1. **Understanding Natural Uranium**: - Natural uranium primarily consists of two isotopes: Uranium-238 (U-238) and Uranium-235 (U-235). - In natural uranium, U-238 makes up about 99.3% while U-235 makes up about 0.7%. 2. **Definition of Enriched Uranium**: - Enriched uranium is uranium in which the percentage of U-235 has been increased compared to its natural abundance. - This is necessary for use in nuclear reactors and weapons, as U-235 is the isotope that is fissile (capable of sustaining a nuclear chain reaction). 3. **Enrichment Process**: - The enrichment process involves separating U-235 from U-238 to increase the concentration of U-235. - Enriched uranium typically contains a higher percentage of U-235 than found in natural uranium. 4. **Analyzing the Options**: - **Option a (U-238)**: This is not enriched uranium as it is predominantly the non-fissile isotope. - **Option b (U-235)**: While U-235 is the desired isotope, simply stating U-235 does not encompass the concept of enrichment. - **Option c (U-235 + Radium)**: This is incorrect as radium is not involved in the enrichment of uranium. - **Option d (U-235 + U-238)**: This option correctly indicates that enriched uranium contains both isotopes, with a higher concentration of U-235. 5. **Conclusion**: - The correct answer is **Option d (U-235 + U-238)**, as it reflects the composition of enriched uranium, which contains both isotopes but with a higher proportion of U-235. ### Final Answer: **d. U-235 + U-238** ---
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