1 A.U. is equal to

Options

A. `1.5 xx 10^(11)` m
B. `1.5 xx 10^(10)` m
C. `1.5 xx 10^(9)` m
D. `1.5xx 10^(-11)` m

Answer

To solve the question "1 A.U. is equal to", we need to understand what an Astronomical Unit (A.U.) represents.

### Step-by-Step Solution:

1. **Definition of Astronomical Unit (A.U.)**:
- An Astronomical Unit is defined as the average distance from the Earth to the Sun.

2. **Value of 1 A.U.**:
- The standard value of 1 A.U. is approximately 1.5 x 10^11 meters.

3. **Identifying the Correct Option**:
- We are given multiple options:
1. 1.5 x 10^11 meters
2. 1.5 x 10^10 meters
3. 1.5 x 10^9 meters
4. 1.5 x 10^-11 meters
- From our definition, we can see that the correct value of 1 A.U. is 1.5 x 10^11 meters.

4. **Conclusion**:
- Therefore, the answer to the question "1 A.U. is equal to" is **1.5 x 10^11 meters**, which corresponds to **Option 1**.