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

The formula used to calculate the distance travelled by light in a year is based on the fundamental relationship that distance equals speed multiplied by time.

In this context, the speed of light in a vacuum is approximately (3 \times 10^8) meters per second. To find the distance light travels in one year, you need to multiply this speed by the total number of seconds in one year. By converting one year into seconds (which is 31,536,000 seconds), the calculation looks like this:

Distance = Speed x Time = ((3 \times 10^8 , m/s) \times (31,536,000 , s)).

This multiplication gives you the total distance light travels in one year, which is often referred to as a light-year.

Thus, the option that combines the speed of light with the conversion of time into seconds gives the right approach to finding the distance light travels in one year.