2022年10-12月高含金量人文社科竞赛汇总
申请美国大学越来越内卷，尤其是名校申请。复盘近三年被TOP20录取的大陆学生，或多或少都有学术活动经历，甚至有家长总结“学术活动是申请TOP20的标配”。虽然不是很准确，但已经足以说明“内卷”程度。 2022年已过大...
Edexcel A Level Physics:复习笔记5.32 Wave-Particle Duality
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...
Edexcel A Level Physics:复习笔记5.31 Pulse-Echo Technique
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...
Edexcel A Level Physics:复习笔记5.30 Transmission & Reflection of Waves
Transmission & Reflection of Waves When waves are incident on the interface between two different media, they are either transmitted or reflected 'Incident on' simply means 'to meet' The interf...
Edexcel A Level Physics:复习笔记5.29 The de Broglie Equation
The de Broglie Equation Using ideas based upon the quantum theory and Einstein’s theory of relativity, de Broglie theorised that not only do EM waves sometimes behave as particles, but that very sm...
Edexcel A Level Physics:复习笔记5.28 The Wave Nature of Electrons
The Wave Nature of Electrons Electron diffraction was the first clear evidence that matter can behave like light and has wave properties This is demonstrated using the electron diffraction tube The...
Edexcel A Level Physics:复习笔记5.27 Core Practical 8: Investigating Diffraction Gratings
Core Practical 8: Investigating Diffraction Gratings Aim of the Experiment To find the wavelength of light using a diffraction grating Variables Independent variable = Distance between maxima, h De...
Edexcel A Level Physics:复习笔记5.26 The Diffraction Grating Equation
The Diffraction 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,...
Edexcel A Level Physics:复习笔记5.25 Diffraction
Diffraction Diffraction is the spreading out of waves when they pass an obstruction Diffraction through a gap This obstruction is typically a narrow gap (a slit, or aperture) Diffraction is usually...
2022北美驯鹿数学思维挑战赛Caribou Contest报名开启！第一轮考试时间已公布
风靡29个国家，每年有16万中小学生同台竞技，全球统一排名，这是一项不专注于“难”题，而是通过“交互式”的新颖问题激发学生对数学的兴趣，提高解决问题能力的学术活动—北美驯鹿数学思维挑战赛。 学术活动简介 驯鹿...
Edexcel A Level Physics:复习笔记5.24 Plane Polarisation
Plane Polarisation Transverse waves can oscillate in any plane perpendicular to the direction of motion (and energy transfer) of the wave Such waves are said to be unpolarised Polarisation occurs w...
Edexcel A Level Physics:复习笔记5.23 Magnification
Magnification Magnification as a Ratio of Heights Magnification means how much larger the image is than the object This is the ratio of the image/object height Where: m = magnification hi = image ...
