A progressive wave is represented by the equation where y is in mm, t in seconds and x is a distance from fixed point origin, O in meters. Find

(a) Frequency, wavelength and speed of the waves
(b) phase difference between point 0.25m and 1.10m from O

To find the frequency, wavelength, and speed of the progressive wave represented by the given equation, we need to analyze the wave equation. However, you have not provided the equation for the wave. Could you please provide the correct equation so that I can assist you further?