Question

Two sinusoidal waves, identical except for phase, travel in the same direction along a string, producing a net wave

y´(x, t) = (1.9 mm) sin(39x - 7.1t + 0.95 rad)

Answer 1

What is (b) the phase difference between them, and (c) their amplitude ym (in mm)?

Answer 2

I am stuck on c more than b. I can;'t say the amplitude is 1.9mm because the two waves superimpose on each other creating a resultant wave.

Answer 3

Thanks!