Q. The energy equivalent to a kilogram of matter is about
A) $10^{20}\ J$
B) $10^{17}\ J$
C) $10^{14}\ J$
D) $10^{11}\ J$
Explanation
(b) Energy is given by
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ E = mc^{2}\ = \ 1\ \times \ \left( 3\ \ \times 10^{8} \right)^{2}$
$= 9\ \ \times \ \ 10^{16}\ = 10^{17}\ $joule approximately
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.