Problem 2

Given information

 A star is in equilibrium when it radiates at its surface all the energy generated in its core.

Step-by-step explanation

There is an increase in the energy of the gas atoms when generation of energy by a star is greater than radiation of energy further leading to make up the star. This increases the speed of the atoms, which further leads to increase in temperature. As the temperature increases, the radiant energy from the star increases which takes it back to an equilibrium state.