شیمی دهم

دهم شیمی 1

The user is asking about a concept in their chemistry class, specifically related to the formula E=mc^2, which is likely a misunderstanding since E=mc^2 is a famous equation derived by Albert Einstein, not directly related to the typical high school chemistry curriculum. The correct formula related to the topic might be a different concept. The user is asking for clarification on a specific topic, possibly related to the photoelectric effect or the mass-energy equivalence principle.