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The energy in a nuclear reaction comes from the release of some of the residual binding energy that holds the nucleus together. When you split heavy isotopes, such as uranium-235, or when you fuse light isotopes, such as hydrogen-2, the total binding energy required is reduced by a small amount. This difference is released as heat and radiation.

This release of energy is accompanied by what seems to be a loss of mass. (But see the next paragraph for clarification.) Its what we call mass-energy equivalance, and it is precisely described by Einstein's equation e = mc2, where energy in joules is equal to mass in kilograms times the speed of light in meters per second squared. (The actual equation is dimensionally consistent, and you can use any system of units desired.)

One area of common misunderstanding is that this does notmean that energy is created or mass is lost, or vice versa. Energy can neither be created nor destroyed, and the same applies to mass - they can only be moved from one frame of reference to another. What the mass-energy equivalance means is that energy ismass, and mass is energy. Put simply, when a nuclear reaction occurs and there is a release of energy, the accompanying loss of mass is "carried away", or contained within the energy release.

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Related Questions

Where does the energy come from in a nuclear fission reaction?

In a nuclear fission reaction, the energy comes from the splitting of atomic nuclei.


The energy produced by a nuclear reaction comes from what?

The energy in a nuclear reaction comes from the release of some of the residual binding energy that holds the nucleus together. When you split heavy isotopes, such as uranium-235, or when you fuse light isotopes, such as hydrogen-2, the total binding energy required is reduced by a small amount. This difference is released as heat and radiation.


Define Q-value of a nuclear reaction?

Q- value is a deterministic factor for the possibility of nuclear reaction. it is the difference of rest masses of the product and reactant of the reaction, and if it comes positive this means some energy added for the reaction to happen, and if it comes negative then the reaction will progress with the emission of energy.


The suns own energy comes from solar energy?

Yes, the sun's energy is produced through nuclear fusion in its core, where hydrogen atoms combine to form helium, releasing a tremendous amount of energy in the process. This energy is then emitted as sunlight and other forms of electromagnetic radiation.


Is all nuclear energy produced the same way?

All useful nuclear energy produced on Earth comes from nuclear fission of U-235 and/or Pu-239, in a variety of different reactor designs. In the stars it comes from fusion of hydrogen, not fission.


Does 68 percent of eletrical energy in the united States produced by nuclear fuel?

No. Only about 20% of the nations energy comes from nuclear fission.


When a nuclear fission reaction occurs an enormous amount of energy is released This energy comes from?

The release of excess binding energy.


What is the relationship between solar energy produced by the sun to nuclear energy your facilities use?

Energy produced in the sun arises from nuclear fusion of hydrogen nuclei, whilst nuclear energy used in power plants comes from fission of uranium nuclei. They are very different.


Why is the power produced by nuclear weapons so great?

the energy comes from the strong nuclear force, which is almost unbelievably powerful.


What type of energy comes from nuclear uranium atoms?

Nuclear energy comes from the process of splitting uranium atoms in a controlled reaction called nuclear fission. This reaction releases a large amount of heat energy, which is used to generate electricity in nuclear power plants.


Connection between nuclear reaction to global warming?

I don't think there is any connection, apart from the fact that the sun's energy comes from nuclear fusion


What is nuclear energy like?

Nuclear energy is produced by splitting atoms in a process called nuclear fission. This generates a large amount of heat, which is used to produce steam that drives turbines to generate electricity. Nuclear energy is a low-carbon energy source but comes with risks such as nuclear accidents and long-term storage of radioactive waste.