This three slide presentation uses two communication timing examples – round trip time for an Internet packet from Los Angeles to southern Chile and the time it takes to see and pick up a pen. I use it to introduce Ping, define a millisecond and emphasize the dramatic speed of Internet communication and our knowledge of the brain and nervous system. I intend it to generate interest in subsequent modules on data communication rate. 
| Spring wave | Waves are the result of a disturbance or variation that transfers energy progressively from one point to another. |
| String wave | Click slowly or rapidly (change the frequency) to see the effect on wavelength (the distance between successive peaks). |
| Particle wave | This is how sound is transmitted. Note that the disturbance propagates, but the particles stay in the same place. |
| Tsunami wave | Note that the wave attenuates as it loses energy. (Its amplitude (height) diminishes). |
| Do the wave | Again, the people stay in the same seats as the disturbance propagates. |
© animations copyright Cisco Systems and Dan Russell
PowerPoint presentation
