Some physics students are studying waves and vibrations. In the laboratory, they created a wave on a rope to observe its characteristics. The wave is described by the equation P (x, t) = 0.02 sin (40x - 1500t). Here, all the quantities are given in SI units. Find an expression for a wave having the same frequency, amplitude, and wavelength but that travels in the opposite direction.

• A. P'(x,t) = 0.02 sin (40x + 1500t)
• B. P'(x,t) = 0.02 sin (40x - 1500t)
• C. P'(x,t) = -0.02 sin (40x - 1500t)
• D. P'(x,t) = -0.02 sin (40x + 1500t)