Atomic Line Spectra An emission line spectrum is produced when: An excited electron in an atom moves from a higher to a lower energy level and emits a photon with an energy corresponding to the dif...
The Particle Nature of EM Radiation The Particle Nature of Light In classical wave theory, electromagnetic (EM) radiation is assumed to behave as a wave This is demonstrated by the fact EM radiatio...
The Electronvolt The electronvolt is a unit which is commonly used to express very small energies This is because quantum energies tend to be much smaller than 1 Joule The electronvolt is derived f...
The Photoelectric Equation Since energy is always conserved, the energy of an incident photon is equal to: The work function + the maximum kinetic energy of the photoelectron The energy within a ph...
The Photoelectric Effect The photoelectric effect is the phenomena in which electrons are emitted from the surface of a metal upon the absorption of electromagnetic radiation Electrons removed from...
和体制内一样，英国教育部也会在“黄金九十月”发布GCSE最新考试政策，各大考试局会根据教育部的相关政策，做出相应回复，修改考试大纲，增减主题内容。 英国教育部和考试监管机构Ofqual官宣2022年秋季及2023年夏季...
Energy of a Photon Photons are fundamental particles which make up all forms of electromagnetic radiation A photon is a massless “packet” or a “quantum” of electromagnetic energy What this means is...
Wave-Particle Duality Light can behave as a particle (i.e. photons) and a wave This phenomenon is called the wave-particle nature of light or wave-particle duality Light interacts with matter, such...
Pulse-Echo Technique Foetal Scanning In medicine, ultrasound can be used to construct images of a foetus in the womb An ultrasound detector is made up of a transducer that produces and detects a be...
