The Term "Metastable Levels" Refers to

question 49

Multiple Choice

The term "metastable levels" refers to

• A) regions within a molecular cloud that are not moving relative to the rest of the cloud.
• B) the upper energy level of the 21-cm transition in the hydrogen atom.
• C) the lower energy level of the 21-cm transition in the hydrogen atom.
• D) the boundary layers between HI regions and the hotter intercloud medium.
• E) energy levels in an atom that require a much longer time than average to decay and emit a photon.

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