question_answer

We know that light year is the distance travelled by light in one year and the speed of light is \[3\times {{10}^{8}}\] metre per second. Express one light year into kilometre.

A)  \[9.46\times {{10}^{12}}\,km\]

B)  \[9.46\times {{10}^{18}}\,km\]

C)  \[9.46\times {{10}^{15}}\,km\]

D)  \[9.46\times {{10}^{13}}\,km\]

E)  None of these