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Nuclear Fission and Nuclear Fusion: Source of Energy — Chapter Summary

ICSE · Class 12 · Physics

Summary of Nuclear Fission and Nuclear Fusion: Source of Energy for ICSE Class 12 Physics. Key concepts: Nuclear fission is a process, U and A typical U.

69 questions36 flashcards9 formulas & key relations5 concepts

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A step-by-step diagram illustrating the process of nuclear fission, specifically a chain reaction initiated by a neutron striking a Uranium-235 nucleus, leading to the release of energy and more neutr
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An illustration from Super Tutor's Nuclear Fission and Nuclear Fusion: Source of Energy chapter — alongside flashcards, concept maps and practice questions.

Overview

Nuclear energy comes from changes inside the nucleus and is far greater than energy from ordinary chemical reactions. In nuclear fission, a heavy nucleus splits into lighter nuclei and releases a large amount of energy. In nuclear fusion, very light nuclei combine to form a heavier nucleus and also

Key Concepts

Nuclear fission is a process

Nuclear fission is a process in which a heavy nucleus, after capturing a thermal neutron, splits into two lighter nuclei of comparable masses. The pro

U

U-235 is fissionable by slow or thermal neutrons, while U-238 can be fissioned only by fast neutrons above 1 MeV. Natural uranium contains only 0.7% U

A typical U

A typical U-235 fission releases about 200 MeV. The energy comes from the fact that fission fragments have greater binding energy per nucleon than the

Neutrons released in one fission can

Neutrons released in one fission can cause further fissions. If the process continues, a chain reaction is formed. The reaction may be uncontrolled, c

K is the ratio of

K is the ratio of the number of neutrons present at the beginning of the present generation to the number present at the beginning of the previous gen

Learning Objectives

  • Understand nuclear fission and nuclear fusion as two main sources of nuclear energy
  • Explain why U-235 undergoes fission with slow neutrons while U-238 needs fast neutrons
  • Learn the idea of chain reaction and the meaning of multiplication factor K
  • Identify the functions of moderator, control rods, coolant, and shut-off rods in a nuclear reactor
  • Understand how Pu-239 is produced in reactors and why it is useful as a fuel

Frequently Asked Questions

What are the important topics in Nuclear Fission and Nuclear Fusion: Source of Energy for ICSE Class 12 Physics?
Key topics in Nuclear Fission and Nuclear Fusion: Source of Energy include Nuclear Fission, Chain Reaction, Critical Size, and Multiplication Factor, Nuclear Reactor and Its Parts, Production of Plutonium-239 and Reactor Types. Study these first, then practise questions on each for the ICSE Class 12 board exam.
How should I revise Nuclear Fission and Nuclear Fusion: Source of Energy for the ICSE Class 12 board exam?
Learn the core ideas first, then work through the 69 practice questions on Nuclear Fission and Nuclear Fusion: Source of Energy. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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