UKPSC Physics Unit 8: Modern & Nuclear Physics, Radioactivity, Fission & Fusion 1. High-Yield Micro-Notes Radioactivity & Emission Dynamics: Natural radioactivity was discovered in 1896 by French physicist Henri Becquerel (SI unit: Becquerel, Bq). Radioactive decay spontaneously emits three distinct types of radiation: alpha (α) particles (doubly ionized helium nuclei, ⁴₂He²⁺), beta (β) particles (high-speed

UKPSC Physics Unit 7: Magnetism, Magnetic Dipoles & Electromagnetic Induction 1. High-Yield Micro-Notes Fundamental Laws of Magnetism: Magnetic poles always exist in dipoles (isolated magnetic monopoles do not exist in nature). Like poles repel each other, while unlike poles attract each other. The magnetic force between two magnetic poles follows Coulomb’s Inverse Square Law of

UKPSC Physics Unit 6: Electricity, Magnetism & Electronics 1. High-Yield Micro-Notes Conductors, Resistance & Heating Elements: Electrical resistance follows the relation R = ρ·L / A, depending directly on conductor length (L), inversely on cross-sectional area (A), and intrinsically on material resistivity (ρ) and temperature. Silver (Ag) possesses the highest electrical conductivity of all metals

UKPSC Physics Unit 5: Optics, Light, Reflection, Refraction & Human Vision 1. High-Yield Micro-Notes Wave Nature & Interference: In Young’s Double Slit Experiment (YDSE), the fringe separation (fringe width) is given by β = λ·D / d, where λ is wavelength, D is screen distance, and d is slit separation. Reducing slit spacing or increasing

UKPSC Physics Unit 4: Heat, Thermodynamics & Thermal Physics 1. High-Yield Micro-Notes Thermal Properties & Conduction: Thermal conductivity (k) is an intrinsic material property; it depends strictly on the nature and physical composition of the material, not on dimensions like length or cross-sectional area (which determine overall thermal resistance, R = L / (k·A)). Materials