NCERT Solutions for Class 12 Physics Chapter 13 Nuclei

NCERT Solutions for Class 12 Physics Chapter 13 - Nuclei

Welcome to the Chapter 13 - Nuclei, Class 12 Physics NCERT Solutions page. Here, we provide detailed question answers for Chapter 13 - Nuclei. The page is designed to help students gain a thorough understanding of the concepts related to natural resources, their classification, and sustainable development.

Our solutions explain each answer in a simple and comprehensive way, making it easier for students to grasp key topics Nuclei and excel in their exams. By going through these Nuclei question answers, you can strengthen your foundation and improve your performance in Class 12 Physics. Whether you’re revising or preparing for tests, this chapter-wise guide will serve as an invaluable resource.

Exercise 1

Q 1:

(a) Two stable isotopes of lithium 6Li3 and7Li3 have respective abundances of 7.5% and 92.5%. These isotopes have masses 6.01512 u and 7.01600 u, respectively. Find the atomic mass of lithium.

(b) Boron has two stable isotopes, ¹⁰B₅ and ¹¹B₅ . Their respective masses are 10.01294 u and 11.00931 u, and the atomic mass of boron is 10.811 u. Find the abundances of ¹⁰B₅ and ¹¹B₅.

(a) Mass of ⁶Li₃, lithium isotope, m 1 = 6.01512 u

Mass of ⁷Li₃, lithium isotope, m = 7.01600 u

Abundance of ⁶Li₃ , η₁ = 7.5%

Abundance of ⁷Li₃ , η₂ = 92.5%

The atomic mass of lithium atom is given as:

( b ) Mass of boron isotope ¹⁰B₅ , m = 10.01294 u

Mass of boron isotope ¹¹B₅ , m = 11.00931 u

Abundance of ¹⁰B₅, η₁ = x %

Abundance of ¹¹B₅, η₂ = (100 − x ) %

Atomic mass of boron, m = 10.811 u The atomic mass of boron atom is given as:

And 100 − x = 80.11%

Hence, the abundance of is ¹⁰B₅ 19.89% and that of ¹¹B₅ is 80.11%.

Q 2:

The three stable isotopes of neon: ²⁰Ne₁₀, ²¹Ne₁₀ and ²²Ne₁₀ have respective abundances of 90.51%, 0.27% and 9.22%. The atomic masses of the three isotopes are 19.99 u, 20.99 u and 21.99 u, respectively. Obtain the average atomic mass of neon.

Atomic mass of ²⁰Ne₁₀, m₁ = 19.99 u

Abundance of ²⁰Ne₁₀, η₁ = 90.51%

Atomic mass of ²¹Ne₁₀, m₂ = 20.99 u

Abundance of ²¹Ne₁₀, η₂ = 0.27%

Atomic mass of ²²Ne₁₀, m₃ = 21.99 u

Abundance of ²²Ne₁₀, η₃ = 9.22%

The average atomic mass of neon is given as:

Frequently Asked Questions about Nuclei - Class 12 Physics

- 1. How many questions are covered in Nuclei solutions?
- All questions from Nuclei are covered with detailed step-by-step solutions including exercise questions, additional questions, and examples.
- 2. Are the solutions for Nuclei helpful for exam preparation?
- Yes, the solutions provide comprehensive explanations that help students understand concepts clearly and prepare effectively for both board and competitive exams.
- 3. Can I find solutions to all exercises in Nuclei?
- Yes, we provide solutions to all exercises, examples, and additional questions from Nuclei with detailed explanations.
- 4. How do these solutions help in understanding Nuclei concepts?
- Our solutions break down complex problems into simple steps, provide clear explanations, and include relevant examples to help students grasp the concepts easily.
- 5. Are there any tips for studying Nuclei effectively?
- Yes, practice regularly, understand the concepts before memorizing, solve additional problems, and refer to our step-by-step solutions for better understanding.

Exam Preparation Tips for Nuclei

The Nuclei is an important chapter of 12 Physics. This chapter’s important topics like Nuclei are often featured in board exams. Practicing the question answers from this chapter will help you rank high in your board exams.

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