The Cosmic Microwave Background Radiation Was Emitted When the Universe

question 19

Multiple Choice

The cosmic microwave background radiation was emitted when the universe had a size about 1/1,000 of today's value.What was the temperature of the microwave background radiation at the epoch of recombination?

• A) 30 K
• B) 300 K
• C) 3000 K
• D) 30,000 K
• E) 300,000 K

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Definitions:

Surface Anatomy

The branch of anatomy that deals with the external features of the body and their relationship to deeper structures.

Iliac Crest

The upper, outer curved edge of the ilium, the largest bone of the pelvis, important for muscle attachment and landmark in medical examinations.

Lower Torso

The lower part of the human torso, comprising the abdomen and pelvis.

Serratus Anterior

A muscle that originates on the surface of the upper eight or nine ribs and inserts along the entire anterior length of the medial border of the scapula, playing a crucial role in the movement and stabilization of the shoulder.