Give below are some functions of x and t to represesnt the displacement of an elastic wave.
Channel: Doubtnut
Date: 2020-08-02

Give below are some functions of x and t to represesnt 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)pit]cos[(252+2500pit]` (iv)` y=100cos(100pit+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  Give reasons for your answers.