Question

why it is more difficult to start a fusion reaction than that of fusion reaction

Answer 1

Answer:

it is difficult to start a fusion reaction than fission reaction because,

Explanation:

However there are repulsive forces between the fusionable nuclei, so a certain amount of energy must first be introduced to overcome these forces. ... Nuclear fission also relies on a chain reaction; the neutron is the intermediary with (very)low activation energy and that's why fission is a lot easier than fusion.

On Earth it is very difficult to start nuclear fusion reactions that release more energy than is needed to start the reaction. The reason is that fusion reactions only happen at high temperature and pressure, like in the Sun, because both nuclei have a positive charge, and positive repels positive.

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Answer 2

(There is some error in the question. The correct question will be read as: Why it is more difficult to start a fusion reaction than a fission reaction?)

It is more difficult to start a fusion reaction than a fission reaction because more energy is required to bring two nuclei together than to break a nucleus.

Explanation:

• Nuclear fusion reactions are those in which two or more nuclei are brought together to get combined to form a single nucleus.
• On the other hand, nuclear fission reactions are those in which a single nucleus is broken into two or more nuclei.
• In a fission reaction, a neutron is fired at a large and unstable nucleus and it breaks down into two or more smaller nuclei.
• In this process, one or more neutrons and a large amount of energy are released.
• In fusion reaction, two smaller nuclei such as hydrogen are required to collide.
• As both the smaller nuclei are positive, a large amount of energy is required to overcome the repulsive forces.
• This huge amount of amount is possible only at high temperatures and pressure such as in the Sun.
• Fusion can occur in fusion bombs such as hydrogen bombs where fission reaction is used to create high pressure and temperature conditions.
• Thus, it is more difficult to initiate a fusion reaction than a fission reaction.

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