申論題

3. A transverse harmonic string wave has an amplitude of 50.0 mm, a wave length of 6.00 m, and a wave velocity of 12.0 m/s in the negative x direction. At x = 0 and t = 80.0 ms, the transverse displacement is y = 25.0 mm and ＜ 0.

(a) Write an expression for the traveling wave function y(x, t).