What Do Radio Maps of the Spiral Arms of Our

question 39

Multiple Choice

What do radio maps of the spiral arms of our galaxy show?

• A)They reveal that our galaxy is a grand design spiral.
• B)They map the location of dense neutral hydrogen clouds.
• C)They reveal that the Sun is currently located in the centre of a spiral arm.
• D)They map the location of hot O and B stars by the radio radiation they emit.

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Definitions:

Reagent

A substance or compound added to a system to cause a chemical reaction or test for a reaction.

Nitrile

An organic compound containing the cyano group (-C≡N), characterized by a carbon triple-bonded to a nitrogen atom.

Dehydrating

The process of removing water from a substance or compound, often to drive a chemical reaction or preserve materials.

Mechanism

The detailed step-by-step process or pathway by which a chemical reaction occurs, including the rearrangements of bonds and intermediate stages.