What Would You Need to Measure About a Planetary Nebula

question 50

Multiple Choice

What would you need to measure about a planetary nebula to determine how long ago its parent star died?

• A) The mass of the white dwarf
• B) The mass and radius of the white dwarf
• C) The nebula's temperature and radius
• D) The nebula's radius and expansion velocity

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Definitions:

Sales Mix

Sales mix is the proportion of different products or services that a business sells, impacting the overall profitability based on the differing margins of each item.

Operating Income

Profit realized from a business's core operations, calculated before taxes and interest.

Contribution Margin Ratio

A financial metric showing the percentage of sales revenue remaining after variable production costs have been deducted, indicating how much contributes towards covering fixed costs and generating profits.

Net Operating Income

Profit generated from a company's regular business operations, excluding deductions for interest and taxes.