A harmonic wave travelling to the right is described by D (as, t) = (2.5 mm) sin [(3.0 m'l) a: (9.0 51) t], where a: is measured in metres, and t is measured in seconds. The wave encounters a fixed-end point of reection. The reection and the original wave are superimposed to form a standing wave pattern. (a) What are the amplitude, speed, wavelength, and frequency of the resulting standing wave? (b) Write the equation of the resulting standing wave