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Natural Science - Year I

Unit 7: Determining Frequency dependence on string length

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Lab Assignment for Unit 7


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Natural Science Unit 7 Laboratory Activity:
Sound

Goal: To measure how vibrations on a string produce sound at different pitches.

You can create a standing wave on a string by adjusting the tension or the vibration. A standing wave will have nodes at each end of the string, and one or more nodes at intervals along the string.

Materials and Equipment:

Procedure:

  1. Arrange the hook and pulley so that you can attach the string as shown in the diagram:
    Standing Wave Setup
  2. Tie the spring to the end of the string and attach a cup or other container to which you can add weights to change the tension on the string.
  3. Touch the vibration source to the fixed end of the string near the hook so that the string vibrates. You will probably have to do this several times as you.....
  4. adjust weights until you have the right tension to create a standing wave on the string with one node at each end and no nodes in the middle.
  5. Measure the distance between nodes.
  6. Record the weight used.
  7. Repeat the process, but change the tension by increasing the weight pulling on the string until you get a node at the midpoint. Try to get two and three nodes.

Data Analysis:

Report: