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Radioactivity

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Audio Podcast Quiz 1:   Fullscreen Mode Quiz 2:   Fullscreen Mode Other note 1 source Other note 2 source  5.2.1 Detection of radioactivity ## Radioactivity Detection Radioactivity is the process of releasing radiation from an unstable atomic nucleus. We are all exposed to radiation from various sources every day. Let's discuss some important things about radioactivity: ## Background Radiation Sources Background radiation comes from a variety of sources, both natural and artificial: - Cosmic rays from the sun - Radon gas in the air - Radon-containing granite rocks - Potassium-40 in food - Medical procedures that use radioisotopes - Nuclear power plants and the rest of the nuclear bomb tests ## Ionization Effect Radiation can cause ionization, which is the process of releasing electrons from atoms or molecules. This can be evidenced by: Electroscope Experiments: - When a fire or radium source is brought close to a charged electroscope, the charge is los...
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Fractions, Percentages and Standard Form

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Quiz 1:   Fullscreen Mode Fractions, Percentages and Standard Form - Complete Guide 📐 FRACTIONS, PERCENTAGES AND STANDARD FORM 📊 Complete Theory and Formulas for Cambridge IGCSE Grade 9 Mathematics 1️⃣ EQUIVALENT FRACTIONS 📌 Definition Equivalent fractions are fractions that represent the same value but have different numerators and denominators. They are created by multiplying or dividing both the numerator and denominator by the same non-zero number. Key Formula: a b = a × k b × k where k is any non-zero number 1 2 = 2 4 = 3 6 = 4 8 🔍 Cross Multiplication Method To find a missing value in equivalent fractions, use cross multiplication: If a b = c d Then: a × d = b × c Example: Find x if 2 5 ...
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Circles theorem

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Circle Theorems 1. Alternate Segment Theorem The angle between a tangent and a chord at the point of contact is equal to the angle in the alternate segment. θ θ 2. Angle at the Centre Theorem The angle at the center is twice the angle at the circumference when both angles subtend the same arc. 2θ θ 3. Angles in the Same Segment Theorem Angles in the same segment are equal. θ θ 4. Angles in a Semicircle The angle in a semicircle is 90 degrees (a right angle). 90° 5. Chord of a Circle The perpendicular from the center of a circle to a chord bisects the chord (splits the chord into two equal parts). x x 6. Cyclic Quadrilateral The opposite angles in a cyclic quadrilateral are supplementary (they add up to 180°). a b a + b = 180° 7. Tangent of a Circle ...
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