Refraction & Refractive Index Refraction occurs when light passes a boundary between two different transparent media At the boundary, the rays of light undergo a change in direction and a chang...
Equation for the Intensity of Radiation Progressive waves transfer energy The amount of energy passing through a unit area per unit time is the intensity of the wave Therefore, the intensity is def...
Core Practical 7: Investigating Stationary Waves Aims of the Experiment The overall aim of the experiment is to measure how the frequency of the first harmonic is affected by changing one of the fo...
Wave Speed on a Stretched String The speed of a wave travelling along a string with two fixed ends is given by: Where: T = tension in the string (N) μ = mass per unit length of the string (kg m–1) ...
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...
Phase & Path Difference Waves are said to be coherent if they have: The same frequency A constant phase difference Phase Difference Two points on a wave, or on different waves, are in ph...
Interference & Superposition of Waves Interference occurs whenever two or more waves combine to produce a resultant wave with a new amplitude Superposition literally means to be positioned over...
在理科学习时计算器的作用不容小觑。那么，A-Level考试中可以使用计算器吗？ 答案是可以的！A-Level考试中的确有一些科目需要使用计算器。在考试中正确使用计算器可以帮助我们节省时间，提高做题的准确率。 一般...
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