Given below are some functions of `x` and `t` to represent the displacement (transverse or longitudinal) of an elastic wave. State which of these represent `(i)` a travelling wave, `(ii)` a stationary wave or `(iii)` none at all
(a) `y = 2 cis (3x) sin (10t)`
(b) `y =`
(c) `y = 3 sin (5x - 0.5t) + cos (5x - 5t)`
(d) `y = cosx sin t + cos 2x sin 2t`

Given below are some functions of x and t to represent the displacement (transverse or longitudinal) of an elastic wave. State which of these represent (i) a travelling wave, (ii) a stationary wave or (iii) none at all? (a) y=2cos(3x)sin(10t) (b) y=2sqrt(x-vt) (c) y=3sin(5x=-0.5t)+4cos(5x-0.5t) (d) y=cosx sint +cos2x sin2t

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