Tue July 26, 2011 By: Archana Belurgikar

Related to the theory of equation of waves.

Expert Reply
Wed July 27, 2011
periodic functions like sin(wtkx) and cos(wtkx) represent a plane progressive wave.
It has been established that if in wave functions,negative sign appears between t and x ,it implies that the wave is travelling along positive x -axis and vice -versa.
hence,y(x,t)= A sin(wt-kx) represents positive x -direction.
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