Susan is having a debate with her brother about wave movement. She believes that waves will always travel the same speed if they have the same energy, no matter what the medium it is travelling through. Her brother says that this is not correct, and that different mediums lead to different wave speeds. Who is right, and why?

The magnitude of the amount of energy released by burning a fuel source, measured in energy per unit mass, is called its fuel value. note that the fuel value is the negative of the isobaric specific heat of combustion for the fuel. if all the energy obtained from burning 1.23 pounds of butane with a fuel value of 10.85 kcal/g is used to heat 128.0 kg of water at an initial temperature of 18.3 °c, what is the final temperature? note that 1 lb = 453.6 g.