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A wave equation which gives the displacement along the $Y$ direction is given by the equation $y=10^4 \sin (60 t+2 x)$, where $x$ and $y$ are in metres and $t$ is time in seconds. This represents a wave

• ✓
  Travelling with a velocity of $30 \mathrm{~m} / \mathrm{sec}$ in the negative $X$ direction
• B
  Of wavelength $\pi$ metre
• C
  Of frequency $30 / \pi \mathrm{Hz}$
• D
  Of amplitude $10^4$ metre travelling along the negative $X$ direction