1. Two pulses on a string approach each other at speeds of 1 m/s. What is the shape of the string at t = 6 s? A A. B. C. D. C B C 30 0 of 250

2. Fully destructive interference between two sinusoidal waves of the same frequency and amplitude occurs only if they: 30 0 of 250 1.Travel in opposite directions and are in phase 2.Travel in opposite directions and are 180 o out of phase 3.Travel in same direction and are in phase 4.Travel in same direction and are 180 o out of phase 5.Travel in same direction and are 90 o out of phase 6.Set phaser to stun… who knows?!?

3. Which of the following represents a standing wave? 0 of 250 30 1.y(x,t) = 6 sin(3x+2t) – 6 cos(3x+2) 2.y(x,t) = 6 cos(3x-2t) + 6 cos(2t-3x) 3.y(x,t) = 6 cos(3x-2t) – 6 cos(2t-3) 4.y(x,t) = 6 sin(3x-2t) – 6 cos(2t+3x) 5.y(x,t) = 6 sin(3x) – 6 cos(2t)