Q. Let us choose a new unit of length such that the velocity of light in vacuum is unity. If light takes 8 min and 20 sec to cover the distance between sun and earth, this distance in terms of the new unit is
A) 5
B) 50
C) 500
D) $3 \times 10^{8}$
Explanation
New unit of distance = speed in new units $\times$ 500 s
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.