Q. In an inelastic collision an electron excites a hydrogen atom from its ground state to a M-shell state. A second electron collides instantaneously with the excited hydrogen atom in the M-state and ionizes it.At least how much energy the second electron transfers to the atom in the M-state?

A) +3.4 $eV$
B) + 1.51 $eV$
C) - 3.4 $eV$
D) -1.51$eV$
Explanation

(b) $E_{m}$ = $- \frac{13.6}{(3)^{2}}$ = 1.51
Minimum energy required by electron should be $+ \ 1.51\ eV.$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

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