A snapshot of a progressive wave at t = 0 is shown. The time period is T = 2π/ω. Find the equations for propagation in the +x and -x directions, respectively.

Options

• Option A

  y = A sin (kx + ωt), y = A sin (kx - ωt)

• Option B

  y = A cos (kx + ωt), y = A cos (kx - ωt)

• Option C

  y = A sin (ωt - kx), y = A sin (ωt + kx)

• Option D

  y = A sin (kx - ωt), y = A sin (kx + ωt)