The Existence of the Cosmic Background Radiation Tells Us That

question 3

Multiple Choice

The existence of the cosmic background radiation tells us that the early universe was:

• A) much hotter than it is today
• B) much colder than it is today
• C) composed entirely of radiation at early times
• D) composed entirely of stars at early times
• E) about the same temperature as today, but was much more dense

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Definitions:

Lewis Structure

A diagrammatic representation of the bonding between atoms of a molecule and the lone pairs of electrons in the molecule.

Ethyne

Also known as acetylene, it is a colorless gas used as a fuel and a chemical building block.

Double Bonds

Chemical bonds formed when two pairs of electrons are shared between two atoms, resulting in stronger attraction and shorter bond length compared to single bonds.

Lewis Structure

A diagram showing the bonding between atoms of a molecule and the lone pairs of electrons that may exist.