The Planck Time Is

question 7

Multiple Choice

The Planck time is

• A) the time it takes for light to travel across-- or around-- the entire universe.
• B) the time when the cosmic background radiation originated.
• C) the time it takes for an electron in an unexcited hydrogen atom to orbit the nucleus one time.
• D) the time required for pair creation.
• E) the shortest time that has any physical meaning.

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