What element has a hygrogen-like specturm whose lines have wavelength four times shorter than those of atomic hydeogen?

What element has a hygrogen-like specturm whose lines have wavelength

1.	What element has a hygrogen-like specturm whose lines have wavelength four times shorter than those of atomic hydeogen?
Answer» If all wavelength are four times shorter but otherwise similar to the hydrogen atom specturm then the energy levels of the given atom must be four times greater. This means `E_(n)= -(4E_(H))/(n^(2))` compared to `E_(n)= -(E_(H))/(n^(2))` for hydrogen atom. Therefore the specturm is that of `He^(+)ion(Z-2)`

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What element has a hygrogen-like specturm whose lines have wavelength four times shorter than those of atomic hydeogen?

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