Learning Aims:
  • Determine relation between the air column L and frequency f for conical tube
  • Pen and paper (and a worksheet)
  • Coach file with original data
Suggestions for use:

This activity is similar to the one with the guitar and will result in a similar graph. However, the relation between frequency and length is not that simple for a conical tube. Students will find out (and can check this with theory) that the length of the conical tube has to be raised a constant to get a simple relation.

The results based on the original data.

The theoretical value for a cylindrical tube, the measured value and the difference in one diagram.
It appears that this difference is indeed a constant.

Determining the constant based on the photograph.

Possible questions:
  • Predict what the effect will be for the frequency if the temperature is changed.