When a Solar-Mass Star Is Ejecting a Planetary Nebula,the Temperature

question 282

Multiple Choice

When a solar-mass star is ejecting a planetary nebula,the temperature of its exposed core can reach 100,000 K.How does this temperature compare with the core temperature when the star is on the main sequence?

• A) The exposed core is cooler simply because it is exposed to the cold regions of space.
• B) The exposed core is cooler because it is at the end of its fuel supply.
• C) The exposed core is hotter because it was heated by helium fusion rather than hydrogen fusion.
• D) The exposed core is hotter because it was heated by carbon-oxygen fusion rather than hydrogen fusion.

---

Definitions:

Defined-Contribution Plan

Retirement plan in which the employer sets up an individual account for each employee and specifies the size of the investment into that account.

Retirement Income

The financial income one receives after retiring from active employment, which can come from pensions, savings, investments, and government programs.

Social Security Benefits

Government-financed programs providing retirement, disability, survivorship, and death benefits to eligible individuals.

Exempt Amount

The portion of income or value that is not subject to tax or is excluded from calculation under certain conditions or allowances.