In the Very Early Universe, Which of the Following Types

question 26

Multiple Choice

In the very early universe, which of the following types of particles and antiparticles first stopped being spontaneously formed out of photons and why?

• A) protons and neutrons, because their formation requires a larger number of photons
• B) electrons and positrons, because their formation requires a smaller number of photons
• C) protons and antiprotons, because their formation requires higher-energy photons
• D) electrons and neutrinos, because their formation requires lower-energy photons
• E) Protons, antiprotons, electrons, and neutrinos stopped forming at the same time.

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Definitions:

Utility Function

A mathematical representation that relates an individual’s consumption bundle to the level of satisfaction or utility derived from it.

Marginal Utility

The additional satisfaction or utility gained from consuming or using one more unit of a good or service.

Interest Rate

The percentage of a sum of money charged for its use, which can be seen as the cost of borrowing money or the return on saving.

Rule Of 70

A method used to estimate the number of years it will take for a variable to double, calculated by dividing 70 by the annual growth rate.