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 metre and t is in second. Which of the following is correct?
(a) A node occurs at x = 0.15 m
(b) An antinode occurs at x = 0.3 m
(c) The speed wave is 5 ms–1
(d) The wavelength is 0.3 m
