The Chemical Makeup of a Star's Surface Is Usually Inferred

question 211

Multiple Choice

The chemical makeup of a star's surface is usually inferred by

• A) theoretical methods, considering evolution of the star.
• B) spectroscopy of the light emitted by the star.
• C) measuring the chemical elements present in the solar wind.
• D) taking a sample of the star's surface with a space probe.

---

Definitions:

X-Inefficiency

The difference between efficient behavior of businesses in a competitive market and their actual behavior due to a lack of competitive pressure.

Pure Competition

A market structure characterized by an unlimited number of small sellers, identical products, and free entry and exit, leading to perfect competition.

Oligopoly

A market structure in which a few companies dominate the industry, having significant control over prices and supply.

Monopolistic Competition

A trading environment where countless firms peddle products that bear resemblance but are not exact duplicates, offering them a fragment of control in the marketplace.