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An hydrogen atom moves with a velocity u...

An hydrogen atom moves with a velocity u and makes a head on inelastic collision with another stationary H-atom. Both atoms are in ground state before collision. The minimum value of u if one of them is to be given a minimum excitation energy is

A

`6.25 xx 10^(4) ms^(-1)`

B

`2.64 xx 10^(4) ms^(-1)`

C

`4.26 xx 10^(4) ms^(-1)`

D

`2.46 xx 10^(-4) ms^(-1)`

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The correct Answer is:
A
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