(A): Mass and energy are not conserved separately, but are conserved as a single entity called mass - energy.
(R) : Mass and energy conservation can be obtained by Einstein equation for energy.

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Both ‘A’ and ‘R’ are true and ‘R’ is the correct explanation of ‘A’

‘A’ is false and ‘R’ is true

‘A’ is true and ‘R’ is false

Both ‘A’ and ‘R’ are true and ‘R’ is not the correct explanation of ‘A’

answer is A.

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Detailed Solution

The concept of "mass-energy equivalence" states that mass and energy are conserved as a single thing rather than separately.
Using Einstein's famous formula $E = {mc}^{2}$ , a physical system's energy E is calculated as the square root of its mass m and light speed c.
Because one may select units in which c=1, and therefore E = m, this conclusion is commonly referred to as "the equivalence of mass and energy" or simply "mass-energy equivalence."

Hence the correct answer is Both ‘A’ and ‘R’ are true and ‘R’ is the correct explanation of ‘A’.

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