CIE A Level Physics复习笔记9.1.1 Electric Current
Defining Electric Current Electric current is the flow of charge carriers and is measured in units of amperes (A) or amps Charge can be either positive or negative When two oppositely charged condu...
CIE A Level Physics复习笔记8.2.5 The Diffraction Grating
The Grating Equation A diffraction grating is a plate on which there is a very large number of parallel, identical, close-spaced slits When monochromatic light is incident on a grating, a pattern o...
CIE A Level Physics复习笔记8.2.4 Young's Double Slit Experiment
Double Slit Interference Young’s double slit experiment demonstrates how light waves produced an interference pattern The experiment is shown below Young’s double-slit experiment arrangement When a...
CIE A Level Physics复习笔记8.2.3 Two Source Interference
Demonstrating Two Source Interference Interference of sound, light and microwaves can be demonstrated with slits or diffraction gratings Using Water Waves Two-source interference in can be demonstr...
CIE A Level Physics复习笔记8.2.2 Interference & Coherence
Interference & Coherence Interference occurs when waves overlap and their resultant displacement is the sum of the displacement of each wave This result is based on the principle of superpositi...
CIE A Level Physics复习笔记8.2.1 Diffraction
What is Diffraction? Diffraction is the spreading out of waves when they pass an obstruction This obstruction is typically a narrow slit (an aperture) The extent of diffraction depends on the width...
CIE A Level Physics复习笔记8.1.2 Stationary Waves
Stationary Waves Stationary waves, or standing waves, are produced by the superposition of two waves of the same frequency and amplitude travelling in opposite directions This is usually achieved b...
Edexcel IGCSE Chemistry 复习笔记 4.8.3 Condensation Polymers
Edexcel IGCSE Chemistry 复习笔记 4.8.3 Condensation Polymers Condensation Polymers Condensation polymers are formed when two different monomers are linked together with the removal of a smal...
Edexcel IGCSE Chemistry 复习笔记 4.8.2 Disposal of Addition Polymers
Edexcel IGCSE Chemistry 复习笔记 4.8.2 Disposal of Addition Polymers Disposal of Addition Polymers Addition polymers are formed by the joining up of many small molecules with strong C-C bond...
Edexcel IGCSE Chemistry 复习笔记 4.8.1 Addition Polymers
Edexcel IGCSE Chemistry 复习笔记 4.8.1 Addition Polymers Monomers Polymers are large molecules of high relative molecular mass and are made by linking together large numbers of smaller molec...
Edexcel IGCSE Chemistry 复习笔记 4.7.2 Practical: Preparation of Ethyl Ethanoate
Edexcel IGCSE Chemistry 复习笔记 4.7.2 Practical: Preparation of Ethyl Ethanoate Practical: Preparation of Ethyl Ethanoate Aim: To prepare a small sample of ethyl ethanoate Diagram: &...
CIE A Level Physics复习笔记8.1.1 The Principle of Superposition
The Principle of Superposition The principle of superposition states that when two or more waves with the same frequency travelling in opposite directions overlap, the resultant displacement is the...
