AQA A Level Physics复习笔记8.1.5 Background Radiation
Background Radiation Background radiation describes the low level of radiation present in the surroundings at all times There are two types of sources of background radiation: Natural source...
AQA A Level Physics复习笔记8.1.4 Inverse-Square Law of Gamma Radiation
Inverse-Square Law of Gamma Radiation As an electromagnetic wave, gamma radiation shares many of the same wave properties as light Light sources which are further away appear fainter because...
AQA A Level Physics复习笔记8.1.3 Alpha, Beta & Gamma Radiation
Alpha, Beta & Gamma Radiation Alpha Particles Alpha (α) particles are high energy particles made up of 2 protons and 2 neutrons (the same as a helium nucleus) They are usually emitted fr...
AQA A Level Physics复习笔记8.1.2 Changing Models of the Nucleus
Changing Models of the Nucleus John Dalton’s Model (1803) Dalton imagined that all matter was made of tiny solid particles called atoms Dalton’s model proposed: Atoms are the smallest consti...
AQA A Level Physics复习笔记8.1.1 Rutherford Scattering
Rutherford Scattering Evidence for the structure of the atom was discovered by Ernest Rutherford in the beginning of the 20th century from the study of α-particle scattering The experimental...
AQA A Level Physics复习笔记7.10.5 Transformer Inefficiencies
Inefficiencies in a Transformer Inefficiencies in a transformer appear not from just the core, but also in the wires The coils of wire have resistance This causes heat energy to be lost from...
AQA A Level Physics复习笔记7.10.4 Transformer Efficiency
Transformer Efficiency In reality, transformers are not 100% energy efficient This means their power output is less than the power input For an ideal (100% efficient) transformer, the...
AQA A Level Physics复习笔记7.10.3 The Operation of a Transformer
The Transformer Equation A transformer is A device that changes high alternating voltage at low current to low alternating voltage at high current, and vice versa This is designed to reduce ...
AQA A Level Physics复习笔记7.10.2 The Operation of an Oscilloscope
Oscilloscope as a DC & AC Voltmeter A Cathode-Ray Oscilloscope (CRO) is a laboratory instrument used to display, measure and analyse waveforms of electrical circuits It can therefore be used as...
