The ionization energy of hydrogen is 13.6 electron volts or 2.18 × 10-18 J. A photon emitted from a hot O or B star can ionize hydrogen if it has a wavelength no greater than:
A) 2.18 × 10-18 m.
B) 5.69 × 10-11 m.
C) 6.54 × 10-10 m.
D) 9.12 × 10-8 m.
Correct Answer:
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