Light Year: Distance Measurement

The correct answer is option 'C' which is distance. A Light-year is a unit of distance which is used in Astronomy to measure the distance between two celestial bodies. It is the distance that light travels in one year in the vacuum of space at its constant speed of 299,792,458 meters per second. Therefore, it is a unit of distance and not energy, speed, or intensity.

Explanation:

Light year is the distance that light travels in one year. Since light is the fastest thing in the universe, it is a convenient way to measure the vast distances in space. The distance between stars and galaxies is so vast that using units like kilometers or miles is not practical. Therefore, astronomers use the light-year to measure the distance between celestial objects.

The speed of light is constant and is approximately 299,792,458 meters per second. Therefore, the distance that light travels in one year is:

1 light-year = 9.461×10^12 kilometers (km)

This means that light travels approximately 9.461×10^12 kilometers in one year. Therefore, the light-year is a unit of distance, and not energy, speed, or intensity.

Conclusion:

In conclusion, a Light-year is a unit of distance, which is used in Astronomy to measure the vast distances between celestial objects. It is the distance that light travels in one year at its constant speed of 299,792,458 meters per second. Therefore, option 'C' is the correct answer.

Light year is a unit of distance. It is the distance that light can travel in one year.