The equation of the propagating wave is `y=25 sin (20 t+5 x)`,where y is displacement. Which of the following statement is not true

The equation of the propagating wave is y = 25sin(20t + 5x), where y is displacement. Which of the following statements is not true.

The equation of a progressive wave is given by y = 5 cos (100 t - 5x) where y is in microns, x in metre and t is in second. What is the ratio of the maximum particle velocity to the velocity of wave propagation?

The equation of progressive wave is y=a sin (200 t-x) . where x is in meter and t is in second. The velocity of wave is

A wave equation is given by y=4 sin[pi((t)/(5)-(x)/(9)+(1)/(6))] where x is in cm and t is in second. Which of the following is true ?