I've always taken this for granted. Now I am looking for an answer. When electron jumps from a higher orbit to lower orbit it releases energy. Why is the energy in the form of photon? I will take another example which will make my question easy to understand. When two electrons are kept close, they have high potential energy as they repel each other. Since force causes movement, energy will be in the form of kinetic energy. Similarly when electron jumps states, why is the energy in the form of light or photon? Does my question make sense? Thank You!