Question

According to Einstein's special theory of relativity -

• A. Mass and energy are not related.
• B. Mass is another form of energy.
• C. Mass is not a form of energy.
• D. Mass and energy are conserved separately in a reaction.

Answer 1

The correct option is B Mass is another form of energy.

Einstein showed from his theory of special relativity that it is necessary to treat mass as another form of energy.

Before the advent of this theory of special relativity, it was presumed that mass and energy were conserved separately in a reaction.

However, Einstein showed that mass is another form of energy and one can convert mass-energy into other forms of energy, say kinetic energy and vice-versa.

Einstein gave the famous mass-energy equivalence relation,

$E=m{c}^2$

Hence, option $\left(B\right)$ is the correct answer.