1 light year = ............ Km.

Options

A. `9.46 xx 10^(11)`
B. `9.46 xx 10^(12)`
C. `4.96 xx 10^(11)`
D. `4.96 xx 10^(12)`

Explanation

To solve the question "1 light year = ............ Km", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of a Light Year**:
- A light year is a unit of distance that represents how far light travels in one year.

2. **Know the Speed of Light**:
- The speed of light is approximately 299,792 kilometers per second.

3. **Calculate the Distance Light Travels in One Year**:
- First, calculate the number of seconds in one year:
- There are 60 seconds in a minute, 60 minutes in an hour, 24 hours in a day, and approximately 365.25 days in a year (accounting for leap years).
- So, the total number of seconds in a year = 60 seconds/minute × 60 minutes/hour × 24 hours/day × 365.25 days/year.
- This equals approximately 31,557,600 seconds in a year.

4. **Multiply the Speed of Light by the Number of Seconds in a Year**:
- Now, multiply the speed of light (299,792 km/s) by the total number of seconds in a year:
- Distance = Speed × Time
- Distance = 299,792 km/s × 31,557,600 seconds.
- This results in approximately 9.46 trillion kilometers.

5. **Express the Result**:
- Therefore, we can express the distance of one light year as:
- 1 light year = 9.46 × 10^12 kilometers.

### Final Answer:
1 light year = 9.46 trillion kilometers (or 9.46 × 10^12 km).

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