Final answer:
Waves from a heat source like a hooded blowdryer are considered endothermic as they involve the absorption of heat. Processes such as water boiling and gold melting are examples of endothermic reactions, while burning and ice forming are exothermic.
Step-by-step explanation:
Waves that are activated from an outside heat source, such as a conventional hooded blowdryer, are endothermic waves. In an endothermic process, energy in the form of heat is absorbed from the surroundings into the system. Examples of endothermic processes include water boiling, where you must put a pan of water on the stove and give it heat for the water to boil, and gold melting, which also requires the addition of heat. Conversely, exothermic processes release heat into the surroundings, such as the burning of gasoline or a log in a campfire, and ice forming on a pond where heat is being removed from the water.