NCERT solutions for class 12 Physics chapter 13 Nuclei: Do you know that the size of an atom is 10000 times the size of a nucleus? But the nucleus contains 99.9% of the mass of an atom. We know that an atom has a structure. Does the nucleus also have a structure? If so what are the constituents and how they are arranged? All these questions are answered in NCERT solutions for class 12 Physics chapter 13 Nuclei. This chapter comes under modern Physics and you can expect at least one questions for CBSE board exam from NCERT solutions for class 12 Physics chapter 13 Nuclei.
Important formulas:
Radii of the nuclei,
Where A is the mass number and
Mass defect:
Here Z is the atomic number, M is the mass of the nucleus and A is the mass number. This equation tells that the mass of the nucleus is always less than the mass of their constituents.
Another important relation of NCERT solutions for class 12 Physics chapter 13 Nuclei is Einstein's massenergy relation.
Where c is the speed of light.
Another main concept of NCERT grade 12 chapter 13 Nuclei is the law of radioactive decay. This is given by
Where N is the number of nuclei at any time t, is the number of nuclei at any time and lambda is disintegration constant.
The halflife of a radionuclide is given by
Where lambda is the disintegration constant.
13.1 Introduction
13.2 Atomic Masses And Composition Of Nucleus
13.3 Size Of The Nucleus
13.4 Massenergy And Nuclear Binding Energy
13.4.1 Mass – Energy
13.4.2 Nuclear Binding Energy
13.5 Nuclear Force
13.6 Radioactivity
13.6.1 Law Of Radioactive Decay
13.6.2 Alpha Decay
13.6.3 Beta Decay
13.6.4 Gamma Decay
13.7 Nuclear Energy
13.7.1 Fission
13.7.2 Nuclear Reactor
13.7.3 Nuclear Fusion – Energy Generation In Stars
13.7.4 Controlled Thermonuclear Fusion
All the abovementioned topics are important. After completing all these topics try to do NCERT class 12 chapter 13 exercises. If you are unable to solve or have any doubts we are providing you NCERT solutions for class 12 Physics chapter 13 Nuclei below:
View all solved questions of class 12 Physics, chapter 13 Nuclei here.
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Chapter 12 

Chapter 13 

Chapter 14 
Semiconductor Electronics: Materials, Devices and Simple Circuits 
Q.13.1 Two stable isotopes of lithium and have respective abundances of and . These isotopes have masses and , respectively. Find the atomic mass of lithium.
Q.13.6 Write nuclear reaction equations for
Q. 13.10 The halflife of is 28 years. What is the disintegration rate of 15 mg of this isotope?