The Electron in a Singly Ionized Helium Atom,which Consists of Two

question 21

Multiple Choice

The electron in a singly ionized helium atom,which consists of two protons,two neutrons and only one electron,makes a transition from the n = 2 state to the n = 1 state,emitting a single photon in the process.What is the energy of this photon?

• A)3.40 eV
• B)10.2 eV
• C)13.6 eV
• D)40.8 eV
• E)None are correct.

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