Four Traveling Waves Are Described by the Following Equations,where All

question 6

Multiple Choice

Four traveling waves are described by the following equations,where all quantities are measured in SI units and y represents the displacement. I: y = 0.12 cos(3x - 21t)
II: y = 0.15 sin(6x + 42t)
III: y = 0.13 cos(6x + 21t)
IV: y = -0.27 sin(3x - 42t)
Which of these waves have the same period?

• A) I and III, and also II and IV
• B) I and IV, and also II and III
• C) I and II, and also III and IV
• D) All of them have the same period.
• E) They all have different periods.

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