AQA A Level Physics復(fù)習(xí)筆記8.2.3 Half-Life
Half-Life Half-life is defined as: The time taken for the initial number of nuclei to halve for a particular isotope This means when a time equal to the half-life has passed, the?activity?of...
AQA A Level Physics復(fù)習(xí)筆記8.2.2 Exponential Decay
Exponential Decay In radioactive decay, the number of undecayed nuclei falls very rapidly, without ever reaching zero Such a model is known as?exponential decay The graph of number of...
Edexcel IGCSE Chemistry 復(fù)習(xí)筆記 1.9.1 Explaining Conductivity
Edexcel IGCSE Chemistry 復(fù)習(xí)筆記 1.9.1 Explaining Conductivity Conductivity of Covalent Compounds Electric current is the flow of?charged particles This usually refers to electrons, but it c...
AQA A Level Physics復(fù)習(xí)筆記8.2.1 Radioactive Decay
Radioactive Decay Radioactive decay is defined as: The spontaneous disintegration of a nucleus to form a more stable nucleus, resulting in the emission of an alpha, beta or gamma particle Ra...
Edexcel IGCSE Chemistry 復(fù)習(xí)筆記 1.8.1 Metallic Bonding
Edexcel IGCSE Chemistry 復(fù)習(xí)筆記 1.8.1 Metallic Bonding Metallic Bonding Metal atoms are held together strongly by metallic bonding Within the?metal lattice, the atoms lose their valence ele...
AQA A Level Physics復(fù)習(xí)筆記8.1.7 Required Practical: Inverse Square-Law for Gamma Radiation
Required Practical: Inverse Square-Law for Gamma Radiation Aim of the Experiment The aim of this experiment is to verify the inverse square law for gamma radiation of a known gamma-emitting ...
AQA A Level Physics復(fù)習(xí)筆記8.1.6 Radiation Safety
Safe Handling of Radioactive Sources It is very well known that radioactive sources are dangerous if handled improperly When choosing a source to work with, the following characteristics are...
Edexcel IGCSE Chemistry 復(fù)習(xí)筆記 1.7.4 Giant Covalent Structures
Edexcel IGCSE Chemistry 復(fù)習(xí)筆記 1.7.4 Giant Covalent Structures Giant Covalent Structures Covalent bonding can be responsible for substances that have many different structures and therefor...
AQA A Level Physics復(fù)習(xí)筆記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...
