Question

1. Imagine that the energy generation rate in the center of the Sun were suddenly to decrease.

How would the size of the core, and hence density, change in response to changes you described in your answer to the previous question?

2.How would the density change in the previous question in turn affect the energy generation rate and hence the temperature?

3. Put your answers to the three previous questions together to explain how the Sun maintains a perfect structural balance.

Answer 1

Answer-

If the energy generation in the center of sun were suddenly decreased, than Suppose that there was no energy generation in the core, the pressure inside would still remain high, now in this case core of the star would be hotter than the outer surface.
Now energy would try to escape ( by convection, radiation) and a time will come the core core of star will shrink by gravity. This condition will make the core more hotter and finally energy will escape and will finally collapse. Density and temperature will increase.

b) If energy generation rate is suddenly decreased than pressure will still be there and star will shrink and density of star will be increased . As temperature willl increase in core so density will increase.

c) Since all stars are made of hot gas called plasma. The gas is centred at the center of star dur to gravity, and is being supported by the internal pressure inside the star. And most of the stars are in state of equilibrium of inward gravity force and outward pressure of gas inside the core. Also gravity act equally in all direction and there fore gas is symmetrically spread into the space and forming a perfect shape.