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Two hydrogen atoms are in excited state ...

Two hydrogen atoms are in excited state with electrons in`n=2` state.First one is moving to wards left and emits a photon.' of energy `E_(1)` towards right. Second one is moving towards right with same speed and emits a photon of energy `E_(2)` towards right. Taking recoil of nucleus.into account during_emission process :

A

`E_(1) gt E_(2)`

B

`E_(1) lt E_(2)`

C

`E_(1)=E_(2)`

D

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