# Ves On A String Virtual Lab Summary

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ves on a String Virtual Lab

Google PHET and navigate to the waves in a string simulation. Or type in the following web site. http://phet.colorado.edu/simulations/sims.php?sim=Wave_on_a_String Click on Run Now. Adjust the settings on the simulation for zero damping, high tension, manual operation & no end. Wiggle the left end up and down by moving the mouse vertically one time returning to the rest position.
1. Describe the wave.
The waves was a pulse, not a periodic wave. The pulse appeared as a hump that travels along the length of the string and disappeared from the window.

2. How do the individual particles move compared to the motion of the pulse? Watch a green particle.
The energy of the pulse was propagated along the string and
Change the amplitude to 0.75cm and change frequency back to 1.50Hz. Pause the wave again. Does this change the distance between crests? Is the overall wavelength the same as before?
Increasing the amplitude from 0.50 cm to 0.75 cm does not change the distance between the crests and therefore does not change the overall wavelength.
10. Next, adjust tension one notch down. Does this affect amplitude?____ Does this affect wavelength?_____ Decreasing the tension from high to the next notch in between high and low did not change the amplitude of the wave, but did decrease the wavelength.
11. As tension goes down, what happens to the wavelength?______
As the tension goes down, the wavelength decreased from 4.2 cm to 2.5 cm.
12. Change to pulse, fixed end with zero dampening and high tension. Send a pulse and observe what happens to the reflected wave. Sketch the pulse shape before and after the reflection with the fixed end.

13. Next, adjust tension back to high, change it to a fixed end, pulse, and reset the wave. Send a pulse and when it has traveled about half way to the end send a second. When the first pulse is on its way back and the second is moving toward it pause the simulation and then step it while you observe the