For a sinusoidal travelling wave, which phase relations are correct?

Select all that apply

• Option A

  At the same instant, phase difference between two points is Δφ = kΔx.

• Option B

  At the same position, the magnitude of phase change during time Δt is |Δφ| = ωΔt.

• Option C

  k = 2π/λ.

• Option D

  ω = πf.