NCERT solution Class 12 nuclei

NCERT Solutions

Class 12 Physics

Nuclei

NCERT Questions

Q.1
Q.2
Q.3
Q.4
Q.5
Q.6
Q.7
Q.8
Q.9
Q.10
Q.11
Q.12
Q.13
Q.14
Q.15
Q.16
Q.17
Q.18
Q.19
Q.20
Q.21
Q.22

Q.5

A given coin has a mass of 3.0 g. Calculate the nuclear energy that would be required to separate all the neutrons and protons from each other. For simplicity assume that the coin is entirely made of ⁶³₂₉Cu atoms (of mass 62.92960 u).

Mass of a copper coin, m’ = 3 g

Atomic mass of (₂₉⁶³Cu) atom, m = 62.92960 u

The total number of (₂₉⁶³Cu) atoms in the coin, N =

where,

N_A = Avogadro’s number = 6.023 × 10²³

Mass number = 63 g

Therefore N = (6.023 × 10²³ x3)/ (63) =2.868x10²² atoms.

(₂₉⁶³Cu) nucleus has 29 protons and (63-29) = 34 neutrons.

Therefore, Mass defect of this nucleus, ∆m' = ((29 × m_H) + (34 × m_n) – m)

where,

Mass of a proton, m_H = 1.007825 u

Mass of a neutron, m_n = 1.008665 u

Therefore, ∆m' = ((29 × 1.007825) + (34 × 1.008665) − 62.9296)

= 0.591935 u

Mass defect of all the atoms present in the coin, ∆m = (0.591935 × 2.868 × 10²²)

=1.69766958x10²²u.

But 1 u = 931.5

Therefore, ∆m = (1.69766958 × 10²² × 931.5 )

Hence, the binding energy of the nuclei of the coin is given as:

E_b= ∆mc²

= (1.69766958 × 10²² × 931.5 c²)

= 1.581 × 10²⁵ MeV

But 1 MeV = 1.6 × 10⁻¹³ J

E_b = (1.581 × 10²⁵ × 1.6 × 10⁻¹³)

= 2.5296 × 10¹² J

This much energy is required to separate all the neutrons and protons from the given coin.

Nuclei Class 12 Physics NCERT Chapter 13 NCERT Solutions

Solving NCERT textbook questions of Nuclei Class 12 Physics NCERT Chapter 13 is a crucial step to gauge your understanding of the concepts. It provides you with an opportunity to assess your grasp of the material after learning each chapter. We have already provided solutions to all the exercises in the NCERT textbook of Class 12 Physics Nuclei, available in various formats such as video, text, and downloadable PDFs. If you need assistance with any of the NCERT questions or any other academic topics, feel free to ask in the “Ask Questions” section of LearnoHub.com.

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Attempt to Solve Yourself: Before looking at the solution, try to solve or answer the question independently. This practice will help you test your knowledge and problem-solving skills.
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Solve Again Yourself: Once you've understood the solution, attempt to solve the question again by yourself. Repetition and practice solidify your understanding of the concepts and improve retention.
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Attempt All Questions: Make an effort to attempt all the questions provided in the NCERT textbook. This comprehensive practice will help you cover the entire syllabus and reinforce your understanding across various topics. You may refer Class 12 Physics Nuclei Online Test on LearnoHub.com.
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NCERT solutions of Nuclei Class 12 Physics - all questions of all exercises are solved. Q. No. 1, 2, 3, and so on. Complete explanation and detailed solution makes them the best videos for Class 12 Physics Nuclei NCERT solutions.