Question

Assertion :Mass and energy are not conserved separately but are conserved as a single entity called `mass-energy equivalence'. Reason: According to Einstein's special theory of relativity mass and energy are different manifestations of same and all related as $E=m{c}^2$.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

According to the theory of relativity, mass and energy are not conserved separately but are conserved as a single entity called `mass-energy equivalence'. According to Einstein's famous equation $E=m{c}^2$, the energy $E$ of a physical system is numerically equal to the product of its mass m and the speed of light c squared. It is customary to refer to this result as “the equivalence of mass and energy,” or simply “mass-energy equivalence,” because one can choose units in which $c=1$, and hence $E=m$.