Question

MCQ : How many km are there in one light year?

Answer

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Question

How many km are there in one light year?

  1. 9.46 × 1015
  2. 9.46 × 1012
  3. 9.46 × 109
  4. 9.46 × 106

Answer

9.46 × 1012

Explanation

To convert from light years to kilometres, we can use the speed of light as a conversion factor. The speed of light is approximately 299,792.458 kilometres per second. Therefore, we can calculate the distance in kilometres that light travels in one year as follows:

1 light year = (299,792.458 km/s) × (60 s/min) × (60 min/hr) × (24 hr/day) × (365.25 days/year)

Simplifying this expression, we get:

1 light year ≈ 9.46 × 1012 km

Therefore, there are approximately 9.46 × 1012 kilometres in one light year.

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