The energy of an isolated system.

The energy of an isolated system.

a. is always decreasing
b. is always constant
c. is always increasing
d. none of the above

Correct Answer : b. is always constant

Explanation :

The system in which both the mass as well as energy can not be transfered between system and its surrounding is called as isolated system. As the energy can neither be transmitted nor be absorbed, the total energy of an isolated system is always constant.