Question:medium

The maximum wavelength of incident radiation required to ionize a hydrogen atom in its ground state is nearly

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The ionization energy of hydrogen in the ground state is $13.6 \text{ eV}$. The product of Planck's constant and the speed of light is a useful constant for quickly calculating wavelength from energy: $hc \approx 1240 \text{ eV}\cdot\text{nm}$ or $12400 \text{ eV}\cdot\text{\AA}$.

Updated On: Mar 30, 2026

912 nm
1215 $\text{\AA}$
912 $\text{\AA}$
1215 nm

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The Correct Option is C

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