physics chapter 9

Travelling waves

• often when something about the physical world changes, the information about that disturbance gradually moves outward, away from the source in every direction.
• amplitude- the distance from the peaks to the middle of the wave
• wavelength- distance between crests → a full cycle of the wave
• frequency- how many of those cycles pass through a given point every second

                     velocity=wavelength x frequency

• pulse wave- one motion following through
• continues wave-moving the rope back and forth
• all waves have one thing in common:

            -They transport energy as they travel

• super position - when two waves combine

                    -the resulting wave has an amplitude of 2x at the moment of overlap.

                      → the waves then continue in their original direction of motion

• Loose boundaries will reflect waves
• Fixed boundaries will reflect and invert waves