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Two hydrogen atoms undergo head on colli...

Two hydrogen atoms undergo head on collision and end up with zero kinetic energy. Each particle then emits a photon of wavelength 1028 `Å`. Which transition leads to this wavelength ? Calculate the velocity of hydrogen atom before collision `( m_(H) =1.67 xx 10^(-27) kg)`

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`( 3 rarr 1), 4.80 xx 10^(4) m//s`
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