Chapter 13: Nuclei Class 12 Physics NCERT Solutions

Chapter 13 of the NCERT Class 12 Physics textbook, Nuclei, takes us into the heart of atomic science — the atomic nucleus. While earlier chapters explored atoms and electrons, this chapter focuses on the dense central core of atoms, exploring how nuclei behave, what forces hold them together, and how nuclear reactions power both stars and human technology.

To support students Study the structure of nuclei, radioactivity, nuclear reactions, and binding energy through Chapter 13 Nuclei NCERT Solutions. Strengthen your concepts with easy explanations. Download free PDFs for thorough practice. Scroll down for complete, solved NCERT exercises.

What You Will Learn in Chapter 13 – Nuclei

This chapter builds on the idea that most of an atom’s mass is concentrated in a tiny, dense region called the nucleus. It introduces students to nuclear structure, nuclear size, binding energy, and the forces acting inside the nucleus. It also discusses the phenomena of radioactivity and nuclear energy, which are highly relevant in both science and real-world applications.

Key topics covered:

• Composition and size of atomic nuclei

• Nuclear mass and density

• Mass defect and binding energy

• Nuclear stability and binding energy per nucleon

• Radioactive decay: alpha, beta, and gamma emissions

• Radioactive decay law and half-life

• Nuclear fission and fusion

• Practical uses of nuclear reactions and reactors

These topics form a strong conceptual base for higher education in Physics and are often asked in competitive exams like JEE and NEET.

Why Use Our NCERT Solutions for Chapter 13?

Chapter 13 includes theoretical concepts, derivations, and a wide range of numerical problems. Students often find it tricky to apply formulas related to energy-mass conversion and decay laws. That’s where these solutions come in — they simplify the learning process while strengthening conceptual understanding.

Here’s what makes our solutions helpful:

• Every NCERT exercise question is solved clearly

• Step-by-step problem-solving methods for numerical questions

• All formulas used are explained within the solution

• Concepts are broken down into easy-to-follow logic

• Structured according to the official NCERT textbook sequence

• Fully based on the latest CBSE guidelines

These solutions are useful for classroom learning, self-study, and quick revision during exams.

Download Class 12 Physics Chapter 13 – Nuclei Solutions PDF

For added convenience, you can also download the complete PDF of NCERT solutions for this chapter. Whether you’re revising during travel, preparing for a test at home, or solving questions without an internet connection, the PDF makes it easier.

Benefits of downloading the PDF:

• Learn anytime, anywhere

• Keeps all solutions in one organized place

• Saves time during last-minute exam preparation

• Helps maintain a regular practice routine

The download option is ideal for those who want to create a personalized study library.

Important Concepts and Formulas from Chapter 13

Here are some key concepts students should focus on:

• Nuclear radius formula: R=R0A1/3R = R_0 A^{1/3}R=R0​A1/3

• Mass-energy equivalence: E=mc2E = mc^2E=mc2

• Binding energy per nucleon: A measure of nuclear stability

• Radioactive decay law: N(t)=N0e−λtN(t) = N_0 e^{-\lambda t}N(t)=N0​e−λt

• Half-life: T1/2=0.693λT_{1/2} = \frac{0.693}{\lambda}T1/2​=λ0.693​

• Nuclear fission: Splitting of a heavy nucleus into lighter ones

• Nuclear fusion: Combining of light nuclei to form a heavier one

These concepts are not only essential for solving textbook questions but also build a foundation for topics in nuclear physics beyond school level.

Start Solving – Class 12 Physics Chapter 13 Nuclei Solutions

All NCERT solutions for Chapter 13 – Nuclei are provided below. You can begin reviewing individual questions online or download the full set in PDF format for quick reference.

This chapter helps you develop scientific thinking, understand natural nuclear processes, and recognize how nuclear energy is harnessed for human use. With the right guidance and practice, mastering this chapter becomes much easier.

Explore the solutions below and continue strengthening your Physics preparation with clarity and confidence.