What Was the Temperature of the Universe When a Typical

question 18

Multiple Choice

What was the temperature of the universe when a typical CBR photon was no longer able to spontaneously create an electron and positron pair? Note that a photon has an energy equal to the CBR at any point in time has a blackbody spectrum that peaks at ,and the mass of a single electron is .

• A) 2,000 K
• B) 400,000 K
• C) 4 million K
• D) 2 billion K

---

Definitions:

Technology

The application of scientific knowledge for practical purposes, especially in industry or the development of devices, systems, or methods to solve problems.

Inventory Carrying Costs

Expenses associated with storing unsold goods, including warehousing, insurance, taxes, depreciation, and opportunity costs.

Complexity

The quality or state of having multiple parts interconnected or interwoven in a manner that makes a system or problem difficult to understand, predict, or navigate.