1. The problem statement, all variables and given/known data Which of the following situations is a result of resonance? a. Hydro wires "hum" as a mild breeze blows over them. b.A child pushes herself on a swing by moving her legs back and forth appropriately. c.Windows in your house rattle as a large truck drives by. d. Building begin to sway when an earthquake occurs. e. all of the above. 2. Relevant equations 3. The attempt at a solution I choose B because I thought the resonance happens when the frequency of the wave is the same as the frequency of the object, and the hydro wires "hum" is the sound caused by vibration. I don't think that the frequency of an earthquake could be equal to the natural frequency of a building. But the answer my teacher told me is E, it was a quiz so I didn't have time to ask him why so I came here.