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


A

Physics & Space Science

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