Multiple choice

Among the following the lowest-energy state is

  1. excited state

  2. quantum state

  3. ground state

  4. stationary state
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The ground state of a quantum mechanical system is its lowest-energy state; the energy of the ground state is known as the zero-point energy of the system. An excited state is any state with energy greater than the ground state. The ground state of a quantum field theory is usually called the vacuum state or the vacuum.

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