These definitions are from the first year of the OCR A A-Level course and are based on previous exam paper mark schemes. I have formed perfect answers to topics such as the photoelectric effect and questions on stationary waves. There are also definitions from topics such as motion, forces, waves, quantum physics and so on… In these notes, I have used different types of text such as in italics and underlined for different things. If they are in italics, I reckon that we could be asked about them in an exam and the wording would matter. If there is a word in bold, it is a word that the mark schemes have awarded marks for specifically and are really important. If it is underlined and in italics, it is a practical. I am a current year 13 student and my physics teachers have recommended I share this and charge a small fee because of the amount of time and effort I have put into it. Please do not share it with others if you do purchase it, thank you.