The equation of a progressive wave is, `y = 0.4 sin [pi ((t)/(5) - (x)/(9)) + (pi)/(6)]`, where all quantities are measured in SI units. Then which of the following is correct

Options

A. time taken to propagate 1 wave across a point is 10 s
B. wavelength is 18 m
C. amplitude is 0.4 m
D. all the above

Answer

D

Explanation

`omega = (pi)/(5) " " :. 2 pi n = (pi)/(5) " " :. n = (1)/(10)`
`k = (2pi)/(lamda)`
`(pi)/(9) = (2pi)/(lamda) " " :. lamda= 2 xx 9 = 18 m`
`A = 0.4 m`
All of the above are correct