Answer
$N = 1.2 \times 10^{6}$
Work Step by Step
$N = \frac{R (T_{1/2} )}{ln 2}$
Where $R = 38/s$
$T_{1/2} = 6 h \times 3600 s$
$T_{1/2} = 2.16 \times 10^4 s$
so
$N = \frac{(38/s) (2.16 \times 10^4 s )}{0.694}$
$N = 1.2 \times 10^{6}$
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 1304: 46c
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