What is the percentage of ` ""_(92) U ^(235) ` in `""_(92) U ^(238)` ?

Options

A. `0.2`%`
B. `0.7%`
C. `98%`
D. `100%`

Answer

To find the percentage of Uranium-235 (U-235) in Uranium-238 (U-238), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Composition of Natural Uranium**:
Natural uranium consists of two main isotopes: Uranium-235 (U-235) and Uranium-238 (U-238).

2. **Identify the Percentage of U-235**:
It is known that natural uranium contains approximately 0.7% of U-235. This means that out of every 100 parts of natural uranium, 0.7 parts are U-235.

3. **Identify the Percentage of U-238**:
Since U-238 is the other isotope present in natural uranium, the remaining percentage will be U-238. Therefore, U-238 constitutes approximately 99.3% of natural uranium.

4. **Calculate the Percentage of U-235 in U-238**:
To find the percentage of U-235 in U-238, we can use the following formula:
\[ \text{Percentage of U-235 in U-238} = \left( \frac{\text{Percentage of U-235}}{\text{Percentage of U-238}} \right) \times 100 \]
However, since we are looking for the percentage of U-235 in the context of U-238, we can directly state that U-235 is 0.7% of the total natural uranium.

5. **Final Answer**:
The percentage of U-235 in U-238 is 0.7%.

### Conclusion:
The percentage of Uranium-235 in Uranium-238 is **0.7%**.