Q 1931301222.     Given below are some functions of `x` and t to represent the displacement
of an elastic wave.
(i) `y = 5cos(4x)sin(20t)`
(ii) `y = 4sin(5x - t//2) + 3cos(5x - t//2)`
(iii) `y = 10cos[(252- 250)pi t ] cos[(252 + 250) pi t]`
(iv) `y = 100cos(100 pi t + 0.5x)`

State which of these represent

(a) a travelling wave along x-direction (b) a stationary wave
(c) beats (d) a travelling wave along-x direction


NCERT Exemplar 14/34/LAT
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