A sinusoidal wave on a string is described by the equation y = (0.191 m) sin (0.745 x - 42.9 t), where x and y are in meters and t is in seconds. If the linear mass density of the string is 11.7 g/m ...

Question

a) ... determine the phase constant.
b) ... the phase of the wave at x = 2.29 cm and t = 0.197 s.

Answer 1

a) Huh? at x = 0 and t = 0 , y = 0 so the phase constant is 0

b) at x = .0229 m and t = .197

.745(.0229) - 42.9(.197) = -8.434 radians = -482 degrees which is -360 - 123 degrees