Answer
$8$
Work Step by Step
In aluminum wire : $n_1=2$
and in steel wire : $n_2=5$
One standing wave is passing through the two strings
Therefore, the number of nodes observed at this frequency is $(n_1+n_2+1)=8$
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 16 - Waves-I - Problems - Page 476: 59b
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