Provide "acknowledged body of knowledge" related to the concept. Emphasize the most significant aspects of the concept in an organized, organic manner. Present information sequentially so students see continuity. Draw attention to important, discrete details; don't swamp students with myriad facts.

Lecture and explanation of sound waves, amplitude and frequency

Objective: Students will learn the basic concepts of sound waves.

Activity: Teacher explains the concept of sound waves--amplitude, frequency. Demonstrate a sound wave by using a slinky. (Reference 2, p. 508) Explain compressional waves--compressions and rarefractions, wavelength. Explain that sounds of higher pitch have more vibrations per second; sound of lower pitch have fewer vibrations per second. Louder sounds have greater amplitude, more energy. Softer sounds have less amplitude, less energy. References: 1) Discover Science, (6th Grade Text); Scott Foresman and Company, 1989, pp. 240-243. 2) Physical Science, (High School Text); Prentice Hall, 1991, pp. 495-534. 3) Focus on Physical Science, (High School Text); Merrill Publishing Company, 1989, pp. 415-422. Materials: Slinky

Assessment: Student attentiveness, asking and answering of questions.