Equation of a progressive wave is given by $y = 4\sin \left\{ {\pi \left( {\frac{t}{5} - \frac{x}{9}} \right) + \frac{\pi }{6}} \right\}$. Then which of the following is correct
  • A$v = 5\,m/\sec $
  • B$\lambda = 18\,m$
  • C$a = 0.04\,m$
  • D$n = 50\,Hz$
AIPMT 1988, Medium
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