Two sinusoidal 120 Hz waves, of the same frequency and amplitude, are to be sent in the positive direction of an x axis that is directed along a cord under tension. The waves can be sent in phase, or they can be phase-shifted. Figure shows the amplitude y' of the resulting wave versus the distance of the shift (how far one wave is shifted from the other wave). The scale of the vertical axis is set by ys = 6.0 mm. If the equations for the two waves are of the form y(x, t) = ym sin (kx + wt), what are

(a) ym

(b) k,

(c) w, and

(d) The correct choice of sign in front of w?

Transcribed Image Text:

10 20 Shift distance (cm) (wu),