Answer
$3.4\;eV$
Work Step by Step
As, the energy of the hydrogen-atom electron corresponds to $n=2$ level is $E_2=-3.4\;eV$. Therefore, the minimum energy needed to remove this electron
from the atom is $3.4\;eV$.
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 39 - More about Matter Waves - Problems - Page 1216: 36b
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