Answer
Minus sign.
Work Step by Step
We choose the minus sign (between $kx$ and $ωt$) in the argument of the sine function because the wave is shown traveling to the right and the following equation demonstrates it:
$y = y_m sin(kx −\omega{t})$
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 472: 9d
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