A wave in a string has an amplitude of $2\,\, cm.$ The wave travels in the $+ve$ direction of $x-$ axis with a speed of $128\,\, m/s$ and it is noted that $5$ complete waves fit in $4\,\, m$ length of the string. The equation describing the wave is
  • A$y = 0.02\,m\;sin\left( {15.7x - 2010t} \right)$
  • B$\;y = 0.02\,m\;sin\left( {15.7x + 2010t} \right)$
  • C$\;y = 0.02\,m\;sin\left( {7.85x - 1005t} \right)$
  • D$\;y =0.02\,m\;sin\left( {7.85x + 1005t} \right)$
AIPMT 2009, Medium
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