If the equation of progressive wave is given by `y=4 sin pi[(t)/(5)-(x)/(9)+(pi)/(6)]` then, which of the following is correct `?` (Assume SI units )
A. `v= 5 m // sec`
B. `49 pi m//sec`
C. `a=0.04 m`
D. `n=50 Hz`

If the equation of progressive wave is given by `y=4 sin pi[(t)/(5)-(x)/(9)+(pi)/(6)]` then, which of the following is correct `?` (Assume SI units )
A. v= 5cm
B. `lamda = 18 cm`
C. a = 0.04 cm
D. f =50 Hz