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 meters and t in seconds. For this wave:
(1) A node occurs at x = 0.3 m
(2) An antinode occurs at x = 0.15 m
(3) The speed of the wave is 5.0 m/s
(4) The wavelength is 0.4 m
