Nuclei — Revision Notes
NEST · Physics
Quick revision notes for Nuclei — key concepts, formulas, and definitions for NEST Physics preparation.
Revision Notes — Nuclei
Key concepts, formulas, and definitions from Nuclei for NEST Physics preparation.
Key Topics to Revise
Atomic Masses and Composition of Nucleus
- The nucleus contains protons and neutrons (collectively called nucleons)
- Atomic number (Z) = Number of protons
- Mass number (A) = Number of protons + Number of neutrons
Size of the Nucleus
- Nuclear radius R = R₀A^(1/3) where R₀ = 1.2 × 10⁻¹⁵ m
- Nuclear volume is proportional to mass number A
- Nuclear density is constant for all nuclei ≈ 2.29 × 10¹⁷ kg/m³
Mass-Energy and Nuclear Binding Energy
- Mass defect (Δm) = [Z·mₚ + (A-Z)·mₙ] - M
- Binding energy Eᵦ = Δm·c² (energy equivalent of mass defect)
- Binding energy per nucleon = Eᵦ/A
Nuclear Force
- Nuclear force is strongest force in nature within its range
- Acts only within ~1 fm range (short-range force)
- Charge independent - same between p-p, p-n, and n-n pairs
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What topics are covered in Nuclei for NEST?
Nuclei is an important chapter in NEST Physics. It covers key concepts and formulas that are frequently tested in the exam. Key topics include: Atomic Masses and Composition of Nucleus, Size of the Nucleus, Mass-Energy and Nuclear Binding Energy, Nuclear Force.
How important is Nuclei for NEST?
Nuclei is a frequently tested chapter in NEST Physics. Questions from this chapter appear regularly in previous year papers. There are 53 practice questions available for this chapter.
How to prepare Nuclei for NEST?
Start by understanding the core concepts, then solve practice questions. Focus on formulas and their applications. Use revision notes for quick review before the exam.