What atomic transition is singly ionized helium


Problem 1:

What atomic transition in singly ionized helium will produce a photon with the same energy as the smallest energy photon in the Lyman series of hydrogen? (Hint: use energy level diagrams)

Problem 2:

What is the wavelength of a neutron of kinetic energy 1 MeV?

Please explain each one.

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Physics: What atomic transition is singly ionized helium
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