How Is an H II Region Formed

question 127

Multiple Choice

How is an H II region formed?

• A) In a supernova explosion large amounts of hydrogen are ionized, and this forms the H II region.
• B) They are remnants of the earliest period in the universe when only hydrogen existed. They were ionized when the cosmic microwave background radiation was released.
• C) They are hydrogen clouds ionized by the radiation from hot O- and B- type stars.
• D) They are hydrogen clouds ionized in the eruption of the T Tauri phase of the star that they surround.

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Definitions:

Periodic Inventory System

An inventory accounting method where updates to inventory levels are made periodically, often at the end of a financial period.

Purchase Returns and Allowances

Transactions where buyers return goods or are granted reductions in the initial selling price due to defects or other issues.

Purchase Discounts

Purchase discounts are reductions in the price paid for merchandise or services due to early payment by the buyer.

Freight-In

Refers to the transportation cost associated with getting goods from the manufacturer to the place of production or sales.