The Star P Cygni (In the Constellation Cygnus,the Swan)is Surrounded

question 266

Multiple Choice

The star P Cygni (in the constellation Cygnus,the Swan) is surrounded by an extensive low-density atmosphere.It has a bright,continuous spectrum with many narrow,dark absorption lines and a few bright emission lines.The dark absorption lines are produced by:

• A) only the part of the low-density atmosphere that is between Earth and the surface of the star.
• B) the hot, low-density atmosphere of the star emitting light in all directions.
• C) all parts of the star, the stellar surface, and the atmosphere, equally.
• D) the hot, dense, opaque gas of the star's surface.

---

Definitions:

Net Profit Margin

A financial ratio that shows the percentage of profit a company makes for each dollar of sales, after all expenses are deducted.

Return on Equity

A measure of a corporation's profitability that calculates how much profit a company generates with the money shareholders have invested.

Price/Earnings Ratio

A valuation ratio of a company's current share price compared to its per-share earnings, used to evaluate if a stock is over or undervalued.

Return on Equity

A measure of financial performance calculated by dividing net income by shareholder's equity, indicating how well a company uses investments to generate earnings growth.