AP Physics 2mediummcq1 pt
In the ground state of a hydrogen atom, the electron is in the n=1 level. What wavelength of light would be needed to ionize this atom?
A.91.2 nm
B.121.6 nm
C.364.6 nm
D.912 nm
Explanation
Core Concept
To ionize the atom, the electron must be excited from n=1 to n=∞. The energy required is equal to the ionization energy of hydrogen, which is 13.6 eV. Using E = hc/λ, we get λ = hc/E = (1240 eV·nm) / 13.6 eV ≈ 91.2 nm.
Correct Answer
A91.2 nm
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