The fact that the heat energy, which is added to the atoms, is released as light energy is proof of which conservation law?

Answer : It is the proof of Law of conservation of energy.

Explanation :

Law of conservation of energy : It states that the energy can not be created or destroyed. But it changed one state to another state or transferred from one object to another object.

For example : In case of bulb, energy in the form of electricity is converted into the light and heat. Hence energy is conserved.

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explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.