Radioactivity
ICSE · Class 10 · Physics
Quick revision notes for Radioactivity — ICSE Class 10 Physics. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Atomic Structure and Nuclear Composition
- Atoms consist of three fundamental particles: protons (+ve charge), neutrons (neutral), and electrons (-ve charge)
- Nucleus is extremely small (10⁻¹⁵ m to 10⁻¹⁴ m) but contains almost all the atom's mass
- Protons and neutrons are collectively called nucleons and are held together by strong nuclear force
Radioactivity and Types of Emissions
- Radioactivity is spontaneous emission of particles (α, β, γ) from unstable nuclei
- Discovered by Henri Becquerel in 1896; studied by Rutherford in 1903
- Three types of radiations: Alpha (α), Beta (β), and Gamma (γ)
Properties of Radioactive Emissions
- α-particles: Mass = 6.68×10⁻²⁷ kg, Charge = +3.2×10⁻¹⁹ C, Speed = 3×10⁷ m/s
- β-particles: Mass = 9.1×10⁻³¹ kg, Charge = -1.6×10⁻¹⁹ C, Speed ≈ 10⁸ m/s
- γ-rays: No mass, No charge, Speed = 3×10⁸ m/s (speed of light)
Nuclear Decay Equations and Effects
- α-decay: ᴬₓZ → ᴬ⁻⁴Y₍z₋₂₎ + ⁴He₂ (mass decreases by 4, atomic number by 2)
- β-decay: ᴬₓZ → ᴬY₍z₊₁₎ + ⁰e₋₁ (mass unchanged, atomic number increases by 1)
- γ-emission: No change in mass or atomic number, only energy release
Get complete notes with diagrams and examples
Full NotesKey Concepts
Get detailed revision notes for Radioactivity
Super Tutor gives you interactive content for every chapter of ICSE Class 10 Physics — summaries, quizzes, flashcards, and more.
Try Super Tutor — It's FreeFrequently Asked Questions
What are the important topics in Radioactivity for ICSE Class 10 Physics?
Radioactivity covers several key topics that are frequently asked in ICSE Class 10 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Radioactivity — ICSE Class 10 Physics?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision before the exam.
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
More Resources for Radioactivity
Important Questions
Practice with board exam-style questions
Syllabus
What topics to cover
Study Plan
Step-by-step plan to ace this chapter
Flashcards
Quick-fire cards for active recall
Formula Sheet
All formulas in one place
Chapter Summary
Understand the chapter at a glance
Practice Quiz
Test yourself with a quick quiz
Concept Maps
See how topics connect visually