When a Star Leaves the Main Sequence and Expands Toward

question 286

Multiple Choice

When a star leaves the main sequence and expands toward the red giant region, what is happening inside the star?

• A) Helium burning is taking place in a spherical shell just outside the core; the core itself is almost pure carbon and oxygen.
• B) Hydrogen burning is taking place in a spherical shell just outside the core; the core itself is almost pure helium.
• C) Hydrogen burning is taking place in a spherical shell just outside the core; the core has not yet started thermonuclear reactions and is still mostly hydrogen.
• D) Helium is being converted into carbon and oxygen in the core.

---

Definitions:

Linear Inequality

An algebraic inequality that shows the relationship between variables that form a straight line when graphed.

Floor Space

The total area available within a building or room, measured in square units.

Inequality

A mathematical statement indicating that two expressions are not equal, often involving symbols such as < (less than), > (greater than), ≤ (less than or equal to), or ≥ (greater than or equal to).

Linear Inequality

A mathematical expression involving a linear equation that uses inequality signs (like <, >, ≤, ≥) instead of an equal sign.