Four Waves Are Described by the Following Equations,where Distances Are

question 36

Multiple Choice

Four waves are described by the following equations,where distances are measured in meters and times in seconds.
I.y = 0.12 cos(3x - 21t)
II.y = 0.15 sin(6x + 42t)
III.y = 0.13 cos(6x + 21t)
IV.y = -0.23 sin(3x - 42t)
Which of these waves have the same speed?

• A)I and II
• B)I and III
• C)II and III
• D)III and IV
• E)II and IV

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