OUTCOME
By the end of the lesson you will be able to recognize and use the language of fundamental, overtones and harmonics when describing resonance in tubes. You will apply the rule for multiple harmonics as a multiple of the first harmonic, and distinguish the patterns of harmonics made in open and closed pipes.
A reorder can be used to illustrate how sound pressure behaves in an open and closed end tube.
Open ended tubes have a pressure node at each end, where as a tube closed at one end has an anti-node at the closed end and a node at the open end.
Can you spot the error?
LEARNING TASKS
Explain
1. Why is the longest wavelength in an open tube double the tube's length?
2. Why is the longest wavelength in a closed tube four times the length of the tube?
3. There is an error on the very last slide. What is it?
4. How does the above analysis explain why the pitch of the closed reorder sounds an octave lower that the open tube?
Explore and Elaborate
Use the samples you have collected fro wind instruments to examine this using Winscope
Evaluate
These student led tasks will help to deliver differentiated curriculum.
These tasks can be dynamic and constantly changing to reflect needs of learners and opportunities that may arise.