When New Particle Pairs Are Being Created as Fast as They

question 102

Multiple Choice

When new particle pairs are being created as fast as they annihilate, it is:

• A)hydrostatic equilibrium.
• B)thermal equilibrium.
• C)the threshold equilibrium.
• D)the cosmological constant.
• E)the critical density.

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Definitions:

Bipedalism

The ability of an organism to walk on two legs.

Quadrupeds

Animals that use all four limbs for locomotion, typical of many mammals, including those that humans evolved from.

Using Tools

describes the ability or practice of employing physical items to perform tasks more efficiently, a trait observed in humans and some other species.