Which one of these wireless technologies is not in the permeable zone of the radio wave spectrum? 1. remote-controlled toy
2. broadcast television
3. garage door opener
4. weather radar

Do you agree with scientist’s prediction about the warming of alaska and other polar regions?

The image below shows numerous volcanic mountains in the pacific northwest. what is the most likely cause of the volcanic and earthquake activity in this region?

Although longitudinal waves can travel through all media types what is the disadvantage of this type of wave transmission? a) he efficiency of he wave transmission is greatly diminished as the media becomes less dense b) the oscillation of one set of particles has a huge impact on neighboring particles c) particles become too close together as they bump into each other making it more likely to hit other particles down the line