Two waves are described by
Y₁ = 6 cos 180t and y₂ = 6 cos 186t, (both in meters) .
What effective frequency does the resultant vibration have at a point?

Question

Two waves are described by Y₁ = 6 cos 180t and y₂ = 6 cos 186t, (both in meters). What effective frequency does the resultant vibration have at a point? A)92 Hz B)183 Hz C)6 Hz D)3 Hz E)366 Hz

Quizplus · Accepted Answer

The effective frequency of the resultant vibration is the average frequency of the two waves. 
Thus, effective frequency = (180+186)/2 = 183 Hz. Therefore, the best choice is B.

Two Waves Are Described by