The transverse displacement y(x,t) of a wave on a string is given b, y (x, t) = e-(ax^2 + bt^2 + 2√ab xt) This represents a
(a) wave moving in -x direction with speed √(b/a)
(b) standing wave of frequency √b
(c) standing wave of frequency 1/√b
(d) wave moving in + x direction with speed √(a/b)
