Two hydrogen atoms collide head on and end up with zero kinetic energy

CHEMISTRY · Subjective · CBSE · Chemistry · Structure of Atom · Structure of Atom

Problem

Two hydrogen atoms collide head on and end up with zero kinetic energy. Each atom then emits a photon of wavelength 121.6 nm. Which transition leads to this wavelength? How fast were the hydrogen atoms travelling before collision? (

R_H = 1.097 \times 10^7 \text{ m}^{-1}

and

m_H = 1.67 \times 10^{-27} \text{ kg}

)

Related theory

Planck's quantum theory
Atomic Structure
Bohr's atomic model
Structure of Atom
Electron configurations
Bohr's Model of Atom

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