1.5 1.0 0.5 D(z, 1) 0.0 -0.5 -1.0 -1.5 -2 10 A snapshot graph at 1.0 second of a wave travelling to the right is shown below. The frequency of the wave is 2.Hz. D and ac are measured in metres. (a) What is the wavelength? m (b) What is the speed of the wave? m/ s (c) What is the phase constant if the wave is modelled by a cosine function? Take d to be between 0 and x. (You can use "pi" for # or 3.1415) rad (d) What is the phase constant if the wave is modelled by a sine function? Take dy to be between 0 and x. (You can use "pl" for # or 3.1415) rad (e) The general form of a travelling wave is D (a, t) = A cos (kx - wt + (). Write out the formula that describes the motion of the wave using the correct numerical constants. For example with A = 10, k = 5, w = 2, po = 7, write 10 * cos (5 * x - 2 * t + pi) (Use "pi" for 7) D(x, t) =