If the graph represents speed what is measured on the x and y axes

Atransverse wave is traveling on a string stretched along the horizontal x-axis. the equation for the vertical displacement y of the string is given by y = (1.8 x 10-3)cos[π(13x - 60t)], where all quantities are in si units. what is the maximum speed of a particle of the string

Acertain radio station broadcasts radio waves that have a wavelength of 298cm what is its broadcast frequency?

Arrange the images in order to show how lake-effect snow occurs.