A particular hydrogen like atom has its ...

A particular hydrogen like atom has its ground state Binding energy `= 122.4 eV`. It is in ground state. Then

A

Its atomic number is 5

B

an electron fo 90 eV can excite it

C

an electron of kinetic energy 45. 9 eV can be brought to almost rest by this atom

D

an electron fo kinetic energy nearly 2.6 eV may emerge from the atom when electron of kinetic energy 125 eV collides with this atom

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The correct Answer is:

D

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