Four Waves Are Described by the Following Expressions, Where Distances

question 68

Multiple Choice

Four waves are described by the following expressions, 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 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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