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Which electron transitions in singly-ionized Helium (He+) yield photons in the blue (450-500 nm) portion of the electromagnetic spectrum? What are their wavelengths, and what transitions do they represent?

hear is the equation I tried to use an equation creator but did not work, sorry;

1/wave length=Z^2*R(1/nf-1/nI)

where Z is the charge, for Helium=2

and R=1.097*10^7 m^(-1)

ok, I found the wave length to be 455 nm when nf=5 and nf=4, that is the only one I could find, and I do not understand how to answer the first part. Is the found nf and nI the electron transitions, and what does it mean by what transitions does it represent? Thank you

**2. Homework Equations**hear is the equation I tried to use an equation creator but did not work, sorry;

1/wave length=Z^2*R(1/nf-1/nI)

where Z is the charge, for Helium=2

and R=1.097*10^7 m^(-1)

**3. The Attempt at a Solution**ok, I found the wave length to be 455 nm when nf=5 and nf=4, that is the only one I could find, and I do not understand how to answer the first part. Is the found nf and nI the electron transitions, and what does it mean by what transitions does it represent? Thank you

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