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Mass-Energy Equivalence- Special Theory Of Relativity- 6 Video Lecture | Crash Course for IIT JAM Physics

FAQs on Mass-Energy Equivalence- Special Theory Of Relativity- 6 Video Lecture - Crash Course for IIT JAM Physics

1. What is the mass-energy equivalence in the special theory of relativity?

Ans. The mass-energy equivalence, as described in the special theory of relativity, states that mass and energy are interchangeable. This is represented by Einstein's famous equation E=mc^2, where E is the energy, m is the mass, and c is the speed of light. It means that a small amount of mass can be converted into a large amount of energy, and vice versa.

2. How does the mass-energy equivalence relate to the concept of nuclear energy?

Ans. The mass-energy equivalence is the fundamental principle that underlies the concept of nuclear energy. In nuclear reactions, such as those occurring in the Sun or in nuclear power plants, small amounts of mass are converted into a large amount of energy. This is possible because the atomic nucleus contains a large amount of binding energy, which is a form of potential energy associated with the strong nuclear force. When the nucleus undergoes a reaction, a small amount of mass is lost, and this lost mass is converted into a significant amount of energy.

3. Can mass be completely converted into energy?

Ans. According to the mass-energy equivalence principle, mass can be completely converted into energy. However, this conversion requires extremely high energy levels, as given by Einstein's equation E=mc^2. In practice, complete conversion of mass into energy is not achievable with current technology. Nevertheless, nuclear reactions, such as those in nuclear power plants or nuclear weapons, demonstrate partial conversion of mass into energy.

4. How does the mass-energy equivalence impact our understanding of the universe?

Ans. The mass-energy equivalence has had a profound impact on our understanding of the universe. It revolutionized our understanding of the nature of energy, matter, and their interrelationship. It also paved the way for the development of nuclear energy and nuclear weapons. Additionally, it is a key concept in the study of cosmology, as it helps explain the energy sources and phenomena observed in the universe, such as the energy released during the Big Bang and the energy generated by stars through nuclear fusion.

5. Are there any practical applications of the mass-energy equivalence principle?

Ans. Yes, the mass-energy equivalence principle has several practical applications. One notable application is in nuclear power generation, where nuclear reactions convert a small amount of mass into a large amount of energy. This is harnessed to produce electricity in nuclear power plants. The principle also plays a crucial role in medical imaging techniques such as positron emission tomography (PET), which uses the conversion of mass into energy to detect and visualize abnormal metabolic activity in the body.

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Sep 21, 2025 Last updated

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