Question

The equation $ y=A\,\sin \,k(vt-x) $ represents $ \left( k=\frac{2\pi }{\lambda } \right) $

• A. a plane progressive wave travelling along negative X-direction
• B. a plane progressive wave travelling along positive X-direction
• C. a stationary wave
• D. a plane progressive wave travelling along positive Y-direction

Answer 1

Answer: (B)

If the sign between $t$ and $x$ terms is negative the wave is propagating along positive $X$- axis and if the sign is positive, then the wave moves in negative $X$- axis direction.