Hydrogen Atom: How Fast Must a Hydrogen Atom Be Traveling

question 43

Multiple Choice

Hydrogen atom: How fast must a hydrogen atom be traveling for its kinetic energy to be just enough to excite the ground-state atom to its first excited state in a collision? (1 eV = 1.60 × 10^-19 J, m_h ≈ m_proton = 1.67 × 10^-27 kg)

• A) 44.2 km/s
• B) 21.7 km/s
• C) 66.5 km/s
• D) 113 km/s
• E) 51.0 km/s

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