Why is it that when a wave (say transverse) passes from a dense medium (say a spring) into a less dense medium, the transmitted wave is not always larger than the original. I'm not sure, but I believe it has to do with the amount of energy in the original wave, or I'm just completely wrong. Also, why is it that frequency remains constant when a wave changes mediums and is this why speed changes since only wavelength changes? I might ask more questions later. I know a lot of this is info I could just find out from a teacher, but I'm really pressed for time this week, missed last friday, and have a test tuesday. Thanks.