(a) Write an equation for a surface seismic wave moving along the x-axis with amplitude 2.0 cm,...

Question:

(a) Write an equation for a surface seismic wave moving along the −x-axis with amplitude 2.0 cm, period 4.0 s, and wavelength 4.0 km. Assume the wave is harmonic, x is measured in m, and t is measured in s.
(b) What is the maximum speed of the ground as the wave moves by?
(c) What is the wave speed?