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|  Observe students' booklets on sound waves and assess their work using this three-point rubric:
· For a score of 3:Students must answer all questions on their observation sheets accurately and thoroughly; diagrams must accurately demonstrate how sound traveled in each activity and be labeled according to directions.
· For a score of 2:Students must attempt to answer all questions with minor misunderstandings; diagrams are complete with minor errors.
· For a score of 1:Students did not attempt to answer all questions, and some answers show major misunderstandings or are not complete; students did not follow directions to label diagrams; and students have made no attempt to show how sound travels or one which demonstrates little understanding of how sound travels.
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| Perfect Pitch Have students explore pitches by creating their own homemade instruments. Students can simply fill a set of glasses with different amounts of water. Eight glasses with different levels is sufficient for creating an octave of eight notes. After they have done this, strike each glass. Do they all make a note of the same pitch? If not, can they arrange the amount of water in the glasses in such a way as to play a simple tune? They should record the arrangement of the glasses and amounts of water in each glass on paper and add this to their sound notebook. Have students share their tunes and then discuss what they learned from this activity. Explain that the differences in pitch were a result of different heights of columns of air above the water.
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