What is the energy of the photon required to knock the electron out of a singly ionized Helium atom where the electron was in the n = 4 state?
A)3.4 eV
B)1.7 eV
C)10.2 eV
D)51 eV

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The Answer of What is the energy of the photon required to knock the electron out of a singly ionized Helium atom where the electron was in the n = 4 state?
A)3.4 eV
B)1.7 eV
C)10.2 eV
D)51 eV

What Is the Energy of the Photon Required to Knock