Describe in words how the charge of the nucleus to nucleus of an atom changes when increase. it undergoes alpha and beta The emission of a gamma decay. ray does not cause the mass Describe how the charge of a or the charge of the nucleus nucleus changes as it undergoes to change. alpha and beta decay. 4.4.2.3 The randomness Radioactive is random 0.5 How does the activity of a Demonstrate the of radioactive so it is not possible to predict radioactive substance change randomness of the decay. which individual nucleus will with time? decay of a radioactive decay next. But with a large substance by throwing Can you predict, with accuracy, enough number of nuclei it is six dice and getting a which atoms in a radioactive possible to predict how many prediction of the substance will decay first? will decay in a certain number of dice that will amount of time. land on a six. Describe the process of Alternatively, drop 20 radioactive decay as being a random event analogous to coins and get students to predict the number flipping lots of coins not knowing – that will land on a which coins will fall on heads but head. knowing about half of them will on any given throw. 4.4.2.3 Determination of The half-life of a radioactive 0.6 Define the term half-life. Investigate half-life by half-life isotope is the time it takes for throwing a large Calculate the half-life of a calculations and the number of nuclei of the number of Tillich radioactive source from a decay graphical isotope in a sample to halve, bricks. Any that land curve of the radioactive element. methods. or the time it takes for the on the side with the count rate from a sample odd colour get Calculate the mass of a containing the isotope to fall removed and the radioactive substance remaining to half of its initial level. number remaining is after a given time when given the recorded. Plot a graph half-life of the substance and the
charge of the nucleus to increase. The emission of a gamma ray does not cause the mass or the charge of the nucleus to change. Describe in words how the nucleus of an atom changes when it undergoes alpha and beta decay. Describe how the charge of a nucleus changes as it undergoes alpha and beta decay. 4.4.2.3 The randomness of radioactive decay. Radioactive is random so it is not possible to predict which individual nucleus will decay next. But with a large enough number of nuclei it is possible to predict how many will decay in a certain amount of time. 0.5 How does the activity of a radioactive substance change with time? Can you predict, with accuracy, which atoms in a radioactive substance will decay first? Describe the process of radioactive decay as being a random event analogous to flipping lots of coins – not knowing which coins will fall on heads but knowing about half of them will on any given throw. Demonstrate the randomness of the decay of a radioactive substance by throwing six dice and getting a prediction of the number of dice that will land on a six. Alternatively, drop 20 coins and get students to predict the number that will land on a head. 4.4.2.3 Determination of half-life calculations and graphical methods. The half-life of a radioactive isotope is the time it takes for the number of nuclei of the isotope in a sample to halve, or the time it takes for the count rate from a sample containing the isotope to fall to half of its initial level. 0.6 Define the term half-life. Calculate the half-life of a radioactive source from a decay curve of the radioactive element. Calculate the mass of a radioactive substance remaining after a given time when given the half-life of the substance and the Investigate half-life by throwing a large number of Tillich bricks. Any that land on the side with the odd colour get removed and the number remaining is recorded. Plot a graph
AQA-8463-SOW-ATOMIC.DOCX