A wave disturbance in a medium is described by y (x, t) = 0.02 cos (50πt + π/2) cos (10πx), where x and y are in metres and t in seconds
(a) A displacement node occurs at x = 0.15 m
(b) An antinode occurs at x = 0.3 m
(c) The wavelength of the wave is 0.2 m
(d) The speed of the wave is 5.0 m/s
