The displacement y (in cm ) produced by a simple harmonic wave is
`y=(10)/(pi) sin (2000 pi t -(pi x)/(17))` . The periodic time and maximum velocity of the particles in the medium will respectively be
A. `10^(-3) ` sec and 330 m/sec
B. `10^(-4) ` sec and 20 m/sec
C. `10^(-3) ` sec and 200 m/sec
D. `10^(-2) ` sec and 2000 m/sec
