Why Is 21-Cm Radiation So Important to the Study of Interstellar

question 5

Multiple Choice

Why is 21-cm radiation so important to the study of interstellar matter and the Galaxy?

• A)It helps locate the galactic core in Sagittarius.
• B)Emitted by hydrogen, it passes through interstellar dust and lets us map the entire Galaxy.
• C)Emitted by carbon monoxide, it passes through interstellar gas and lets us see places rich inorganic molecules around the Galaxy.
• D)It is emitted by most stars, enabling astronomers to map the entire Galaxy.
• E)It is emitted only in hot regions of star formation, so the pattern of the spiral arms of theGalaxy can be mapped.

---

Definitions:

Job Order Costing

An accounting system that accumulates costs by individual jobs or orders, suitable for customized or distinct products and services.

Predetermined Overhead Rate

The rate estimated before the start of a period, used to allocate manufacturing overhead costs to products based on a chosen activity base.

Factory Payroll

The total wages, salaries, and benefits paid to employees working in a manufacturing facility during a specific period.

Underapplied Overhead

Underapplied overhead occurs when the allocated manufacturing overhead costs are less than the actual overhead costs incurred.