UBC PHAS Demonstration Room Catalog

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====== Travelling Waves ======

{{tag> oscillations_and_waves standing_waves yak_milk_rope transmission located}}

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===== Description =====

A clear rubber rope filled with barium sulphate (a high density powder). It's about 9.5m long (~31 feet). One end is capped with a piece of acrylic rod, the other end is tied to a large brass lobster clasp. 

===== Purpose =====

This is a highly versatile demonstration. It can be used to demonstrate a number of concepts relating to waves and their propagation through media. It can be used to:

  * Demonstrate how transverse waves can propagate through a string,
  
  * Demonstrate the reflection of a pulse from a rigid-non-rigid boundary,

  * Demonstrate reflection and transmission of waves at a boundary,

  * Demonstrate standing waves,

  * Demonstrate different modes of standing waves.

===== Apparatus =====

  * 'Yak's milk'((It was apparently named that by a previous professor who taught here some years ago. He was supposed to have an affinity for very colorful and interesting language- hence the name of this rope.)) rope

===== Setup =====

The tubing is stretched across the lecture theatre with one end fixed to a hook on the wall while the other end is free to be manipulated by hand to show the various demonstrations. If no hook is available, attaching it to a door handle or a volunteer student may also work.  For the non-rigid reflection and for the partial reflection and transmission at a boundary the far end is attached to a piece of cord and the other end manipulated.

The rope may also be laid flat on the floor and viewed with a camera from above. This is another way that travelling waves may be viewed. This definitely works better with the rope under tension and off the ground, though.

Finally, with a TA or volunteer, standing waves can be produced in the Yak's milk rope. Higher-order standing waves can be obtained with sufficiently great effort.

===== Notes =====



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| **Location** | S4 |
| **Maker** | Unknown |
| **Current State** | Working |
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UBC PHAS Demonstration Room Catalog

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