What is the formula used to calculate the distance travelled by light in a year?

The distance travelled by light in a year is calculated using the formula for distance, which is defined as the product of speed and time. In this context, light travels at a constant speed of approximately (3 \times 10^8) meters per second. To determine the distance light travels in one year, you multiply this speed by the total time in seconds that makes up a year.

One year is equivalent to about (3.154 \times 10^7) seconds. Therefore, the correct calculation is:

Distance = Speed × Time Distance = ( (3 \times 10^8 , \text{m/s}) \times (1 \text{ year in seconds}) )

This gives you the total distance light travels in one year, which is the essence of option B, emphasizing the importance of using the correct units for time and speed to find distance.