Answer
$N_{Uo} = 1.684 \times 10^{19}$
Work Step by Step
Before the uranium decays into lead, the original number is
$N_{Uo} = N_U + N_{Pb} $
$N_{Uo} = 1.06 \times 10^{19} + 6.24 \times 10^{18}$
$N_{Uo} = 1.684 \times 10^{19}$
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 42 - Nuclear Physics - Problems - Page 1306: 61c
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