The Conditions in the Early Universe at the Time Matter

question 97

Multiple Choice

The conditions in the early universe at the time matter became decoupled from radiation were (in terms of age t and equivalent temperature T) :

• A) t = 2 × 10¹¹ years , T = 3 K
• B) t = 3 minutes, T = 10⁷ K
• C) t = 380,000 years, T = 3000 K
• D) The universe was never radiation-dominated since matter has always dominated by generating the gravitational field into which the universe has expanded.

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Definitions:

African-Americans

A term referring to citizens or residents of the United States who have origins in any of the black populations of Africa.

Genotype

The genetic makeup of an organism, comprising all of its genes and contributing to its phenotype, or observable characteristics.

Phenotype

The set of observable characteristics or traits of an organism, resulting from the interaction of its genotype with the environment.

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Thread-like structures located inside the nucleus of animal and plant cells, made of protein and a single molecule of DNA, carrying genetic information.