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Two H atoms in the ground state collide inelastically. The maximum amount by which their combined kinetic energy is reduced is 

(a) 10.20 eV (b) 20.40 eV (c) 13.6 eV (d) 27.2 eV

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Initial K.E of two hydrogen atoms in ground state =13.6ev 

K.E of both H atoms before collision =2×13.6=27.2v 

Since the collision is inelastic, linear momentum is conserved, but some K.E is lost. If one H atom goes to first excited state and the other remains in the ground state, then their 

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(a) 10.20 eV

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