Three transverse waves are represented by
y₁ = A cos (kx - ⍵t)
y₂ = A cos (kx + ⍵t)
y₃ = Acos (ky - ⍵t)
The combination of waves which can produce stationary
waves is
(a) y₁ and y₂ (b) y₂ and y₃
(c) y₁ and y₃ (d) y₁, y2 and y₃
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