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Difference Between Nuclear Fission and Nuclear Fusion

Nuclear fission and nuclear fusion are the types of nuclear reactions that involve the disintegration and combination of the elemental nucleus. The main difference between nuclear fission and nuclear fusion is

  • Nuclear Fission: It is the process of splitting a heavy nucleus into two or more lighter nuclei.
  • Nuclear Fusion: It is the process of combining two or more lighter nuclei to form a heavier nucleus.
Difference Between Nuclear Fission and Nuclear Fusion
Difference Between Nuclear Fission and Nuclear Fusion

Read More: Important Questions Class 12 Physics Chapter 13 Nuclei


What is the Difference Between Nuclear Fission and Nuclear Fusion?

The table given below gives detailed information on Nuclear fission vs Nuclear fusion.

Nuclear FissionNuclear Fusion
It is a type of nuclear reaction in which a heavy nucleus splits into lighter nuclei.It is a type of nuclear reaction in which two or more lighter nuclei combine to form a heavy nucleus.
A large amount of energy is released when a nucleus splits into lighter nuclei.The energy released during nuclear fusion is much greater than energy released due to nuclear fission.
As compared to nuclear fusion, less energy is required to split a heavy nuclei in nuclear fission.As compared to nuclear fission, a large amount of energy is required to combine two or more lighter nuclei in nuclear fusion.
Energy released per fission in nuclear fission is about 200 million electron volts (eV).Energy released per fusion in nuclear fusion is about 17.59 Mega-electron volts (MeV).
The principle of working of an Atomic bomb is nuclear fission.The principle of working of a Hydrogen bomb is nuclear fusion.
These reactions do not occurs naturally.These reactions occurs naturally in the sun and stars.
These reactions are exothermic.These reactions are endothermic.
In this reaction, a lot of radioactive decay is formed as byproduct.In this reaction, less radioactive decay is formed as byproduct.
This type of reaction can be performed in nuclear reactor.This type of reaction can not be performed in nuclear reactor due to its very high temperature requirement.

Frequently Asked Questions (FAQs)

Ques. What is nuclear fission?

Ans. It is the type of nuclear reaction in which energy is released when two or more lighter nuclei combine to form a heavier nucleus.

Ques. What is nuclear fusion?

Ans. It is the type of nuclear reaction in which energy is released when a heavy nucleus splits into two or more lighter nuclei.

Ques. What is the main difference between nuclear fission and fusion?

Ans. The main difference between nuclear fission and fusion is that, in nuclear fission two or more lighter nuclei combine to form a heavier nucleus, while in nuclear fusion a heavy nucleus splits into two or more lighter nuclei.

Ques. What type of nuclear reaction occurs in the sun?

Ans. The type of nuclear reaction that occurs in the sun is nuclear fusion.

Ques. What is the chain reaction in a nuclear reaction?

Ans. In nuclear fission, neutrons are produced along with the release of large amounts of energy. These newly produced neutrons can cause further fission of more nuclei. This process continues and is called a chain reaction.

Ques. What is the principle of working of an atom bomb?

Ans. An atomic bomb works on the principle of nuclear fission.

Ques. What is nuclear energy?

Ans. The energy obtained from the conversion of nuclear mass is known as nuclear energy.

Ques. How much energy does 1 kg of uranium produce as compared to 1 kg of coal?

Ans. 1 kg of uranium on fission gives 1014 joule of energy, whereas 1 kg of coal on burning gives only 107 joule of energy.

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