Why Did the Era of Nuclei End When the Universe

question 1

Multiple Choice

Why did the era of nuclei end when the universe was about 380,000 years old?

• A)All the free particles had combined to form the nuclei of atoms.
• B)The universe had expanded and cooled to a temperature of about 3,000 K,cool enough for stable,neutral atoms to form.
• C)Neutrinos and electrons were finally able to escape the plasma of the early universe and no longer heated the other particles.
• D)Photons were finally able to escape the plasma of the early universe and no longer heated the hydrogen and helium ions.
• E)No theory can explain this.

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Definitions:

External Attribution

The process of inferring that a person's behavior is due to situational factors, rather than their own personal characteristics.

Situational Attribution

Attributing a behavior to external factors or the situation in which the behavior occurred.

Personalism

Behaviour that appears to be directly intended to benefit or harm oneself rather than others.

Causal Schemata

Experience-based beliefs about how certain types of causes interact to produce an effect.