What Is the Minimum Speed Needed by a Ground-State Hydrogen

question 8

Multiple Choice

What is the minimum speed needed by a ground-state hydrogen atom for its kinetic energy to be enough to ionize the atom 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