Answer
$y_m = 0.12~mm$
Work Step by Step
$y_m$ is the amplitude of the wave.
In the question, it is given that the amplitude is $0.12~mm$
$y_m = 0.12~mm$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.