Question

Light year is the unit of the

• A. Distance
• B. Time
• C. Speed
• D. Intensity of light

Answer 1

The correct option is A

Distance

Explanation for the correct option

Option (A)

1. Light-year is the unit of length to measure large distances (astronomical distances).
2. The total distance travelled by light in a year is called 1 light year.
3. 1 light-year = 9.46 × 10¹² km.

Explanation for the incorrect options

1. The second is the unit of time.
2. Meter/second is the unit of speed.
3. Candela is the unit of light intensity.

Therefore, Light-year is the unit of distance. Hence, option (A) is correct.