1. The problem statement, all variables and given/known data A wave is described by y=12sin(4t-8x). What is its propagation speed? A. 0.2 B. 0.5 C. 4 D. 8 E. 12 2. Relevant equations v=wavelength/period v=wavelength×frequency 3. The attempt at a solution period= 2π/w=2π/8=.7853 But confused on how to find the wavelength?