A travelling harmonic wave is represented by the equation $y(x, t)=10^{-3} \sin (50 t+2 x)$, where $x$ and $y$ are in meter and $t$ is in seconds. Which of the following is a correct statement about the wave?
Select the correct option:
A
The wave is propagating along the negative $x$-axis with speed $25 \mathrm{~ms}^{-1}$.
B
The wave is propagating along the positive $x$-axis with speed $100 \mathrm{~ms}^{-1}$.
C
The wave is propagating along the negative $x$-axis with speed $100 \mathrm{~ms}^{-1}$.
D
The wave is propagating along the positive $x$-axis with speed $25 \mathrm{~ms}^{-1}$.
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