Q15.34Multiple choice
Given below are some functions of x and t to represent the displacement of an elastic wave.
- (a)y = 5 cos (4x ) sin (20t )
- (b)y = 4 sin (5x – t/2) + 3 cos (5x – t/2)
- (c)y = 10 cos [(252 – 250) πt ] cos [(252+250)πt ]
- (d)y = 100 cos (100πt + 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. Given reasons for your answers.