Answer
Plus
Work Step by Step
As given that the wave is travelling in the -x direction, hence the sign in front of $\omega$ is plus i.e $kx+\omega t$
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 477: 81d
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