(a) For constant phase, x must increase as t increases, so the wave travels in the positive x direction. Comparing the specific form to the general form, we have 6nt - 4x + = kx - wt + 4. 4 The speed and direction of the wave are both specified by the vector wave velocity. v = fai k =1.5 6 rad/s 7 rad/m 1.5 i m/s Part 4 of 6 - Analyze (b) Substituting t = 0, x = 0.117 m, we have (0.325 m) sin (t y The correct answer is not zero. + 1 = Your response differs from the correct answer by more than 10%. Double check your calculations. (0.325 m) sin(-1) = Your response differs from the correct answer by more than 10%. Double check your calculations. (0.325 m) (1 = The response you submitted has the wrong sign. = 0.325 The response you submitted has the wrong sign. m = 32.5 The response you submitted has the wrong sign. cm. Note that when we take the sine of a quantity with no units, the quantity is not in degrees, it is in radians. So we must make sure that the calculator is properly set for entering values in radians.