Multiple choice

A new unit of length is chosen such that the speed of light in vacuum is unity. What is the distance between the Sun and the Earth in terms of the new unit if light takes 8 min and 20 s to cover this distance ?

  1. 100 unit

  2. 500 unit

  3. 2 unit

  4. 20 unit
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Speed of light = 1 unit/s. Time = 8 min 20 s = 500 s. Distance = Speed * Time = 1 * 500 = 500 units.

AI explanation

The speed of light is unity in the new unit system, meaning it travels at a rate of 1 unit per second. The time taken for light to travel from the Sun to the Earth is given as 8 minutes and 20 seconds, which equals 500 seconds. Using the distance formula distance equals speed multiplied by time, the distance is 1 multiplied by 500. Therefore, the distance is 500 units.

Keep practicing — related questions