Hi folks, Today we took time to learn about natural frequency and resonance as well as a few more bits and pieces regarding waves and how they transfer energy. Homework for next week is to: Read the Sound chapter in the book. Pages 390 to 400 (We've been talking on and off about sound this entire unit. This chapter will help to solidify a lot of the concepts we've already been discussing.) Do Review Questions on page 401 #'s 1 - 20. Best, Jim Mueller (919) 907-3217