A travelling wave represented by `y=Asin(omegat-kx)` is superimposed on another wave represented by `y = Asin(omegat + kx)` . The resultant is
| A. |
a standing wave having nodes at x `=(n+1/2)lambda/2`, where n=0, 1, 2 |
 |
| B. |
a wave travelling along + x direction |
| C. |
a wave travelling along - x direction |
| D. |
a standing wave having nodes at `x=(nlambda)/2` where n=0,1,2 |