Ask Questions, Get Answers

Want to ask us a question? Click here
Browse Questions
Home  >>  JEEMAIN and AIPMT  >>  Physics  >>  Class11  >>  Units and Measurement
0 votes

What is the value of a light year in SI Units?

$\begin{array}{1 1}(A)\;9.467 \times 10^{15} \\(B)\;2.3 \times 10^{7} \\(C)\;9 \times 10^{8} \\(D)\;25 \times 10^{3} \end{array} $

Can you answer this question?

1 Answer

0 votes
A light year is the distance travelled by light, in vacuum, in one year .
Since velocity of light $= 3 \times 10^8 ms^{-1}$
1 year $=365 \large\frac{1}{4} $$ \times 24 \times 60 s$
therefore 1 light year $= (3 \times 10^8 ms^{-1} )$
$\qquad= 9.467 \times 10^{15} m$
Hence A is the correct answer.
answered Jul 10, 2014 by meena.p
Ask Question
student study plans
JEE MAIN, CBSE, NEET Mobile and Tablet App
The ultimate mobile app to help you crack your examinations
Get the Android App