Before the Decoupling

question 85

Multiple Choice

Before the decoupling,

• A) deuterium produced electrons and positrons.
• B) protons and electrons combined to form atoms.
• C) the universe was opaque to radiation.
• D) there was more helium than hydrogen.
• E) the universe was transparent to radiation.

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Definitions:

Sodium Sulfate

An inorganic salt used in detergents, paper manufacturing, and glass production, known chemically as Na2SO4.

Atoms

Atoms are the basic units of matter and the defining structure of elements, consisting of a nucleus surrounded by electrons, and classified by the number of protons they contain.

Washing Detergent

A chemical substance used to break up and remove dirt and grease from fabrics, commonly in the form of powder or liquid.

Calcium Nitrate

An inorganic compound used as a nitrogen fertilizer in agriculture and also in waste water pre-conditioning for odor emission prevention.