If an object lose energy when it emits light, does that energy come from the mass of the object?
Does a flashlight lose mass when it's turned on?
Does a regular object (like a pencil or a piece of paper) lose mass when the environment is colder than the object?
If there is a loss of mass, what specific part of the atomic structure does that mass come from?
Does it come from electrons (or other particles) losing mass? (in which case it would lead to some electrons having more mass than others?)
Or does it come from whole particles being converted to energy?
Or does it come from the kinetic energy of its molecules?