Standing waves demo using a string

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Discussion Overview

The discussion revolves around demonstrating standing waves using a string, focusing on practical methods and equipment design. Participants explore various approaches to effectively visualize standing waves in a mechanical setup.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant seeks ideas for a demonstration that mechanically shows standing waves using a string.
  • Another suggests using a jump rope fixed at one end, although this involves physical effort.
  • A participant emphasizes the need for a designed piece of equipment rather than using arm movement.
  • Concerns are raised about using very light strings, which may be difficult to work with due to low mass and potential damping effects from air.
  • One suggestion involves constructing a version of Melde's experiment using a small electric motor, string, pulley, and weights.
  • A participant mentions that achieving a decent standing wave requires significant tension in the string and recommends using sewing elastic for better results.
  • Another creative idea involves gluing popsicle sticks to the string to visualize the standing wave more effectively by manipulating the sticks.

Areas of Agreement / Disagreement

Participants present multiple competing views on the best methods to demonstrate standing waves, with no consensus reached on a single approach. Various techniques and materials are suggested, reflecting differing opinions on effectiveness.

Contextual Notes

Some suggestions depend on specific assumptions about the materials used, such as the mass of the string and the tension required to create visible standing waves. The effectiveness of different methods remains unresolved.

Who May Find This Useful

This discussion may be useful for educators, students, or hobbyists interested in physics demonstrations, particularly those exploring wave phenomena and mechanical setups.

solas99
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im trying to demonstrate a standing wave using a string..can anyone help me with ideas on how to preform such demonstration.
 
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Use a jump rope or something at least as long and fix one of the ends. You do have to give your arm a bit of a work out though.
 
im trying to mechanically show it using a string..nothing to do with my arms moving..
i got to design a piece of equipment that will contain a string showing a standing wave..
 
I've never done it with a string. I think that very light strings are harder to work with because they have little mass. The surrounding air may act as a dampener and make it more difficult for a reflected wave to sustain itself. You could try I guess but I have had good luck with using a long thin rope that had a little heft to it. Tie one end off on the end of a table and just wave your arm up and down.
 
It should be possible to construct a simple version of Melde's experiment using a small electric motor, a string, a pulley and some weights.
http://en.wikipedia.org/wiki/Melde's_experiment
http://www.practicalphysics.org/go/Experiment_129.html
 
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With ordinary string (or wire) you have to get a large amount of tension to make a decent standing wave.

Just go to a haberdasher (sewing shop) and obtain some sewing elastic and use that . It will work a treat.
 
Glue popsicle sticks to the string at the center of the stick all the way along the string side by side. Slightly weigh down the bottom of each stick with anything. Attach the string at both sides.

Now all you need to do is turn the first stick to 90 degrees and let go, then watch the standing wave from the top. Standing wave from a string... and sticks.
 

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