A particular hydrogen like atom has its ground state binding "energ...

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A particular hydrogen like atom has its ground state binding "energy \( 122.4 \mathrm{eV} \). Its is in ground state. Then:
\( \mathrm{P} \)
(A) Its atomic number is 3
(B) An electron of \( 90 \mathrm{eV} \) can excite it.
W
(C) An electron of kinetic energy nearly \( 91.8 \mathrm{eV} \) can be brought to almost rest by this atom.
(D) An electron of kinetic energy \( 2.6 \mathrm{eV} \) may emerge from the atom when electron of kinetic energy \( 125 \mathrm{eV} \) collides with this atom.
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