Revision for aqa physics gcse, including summary notes, exam questions by topic and videos for each module. Free physics revision notes on the topic half life. Worksheet where pupils plot a graph of activity to find the half life, and hence the identity, of an element. Radioactive halflife halflife wjec gcse physics single.
The half life of a sample can be established by using two radiation levels and the time between the readings. Worksheet revising the equations and calcuations for the edexcel igcse radioactivity topic. Radioactive decay cie igcse physics revision notes. Isaac physics a project designed to offer support and activities in physics problem solving to teachers and students from gcse level through to university. Here, we define halflife and introduce you to some equations that can be applied to halflife and even a short section on the basics of logarithms. These videos are designed to help with your gcse science revision. Buy gcse physics revision guide with online edition by cgp books isbn. In the same amount of time, the picture on the right above will lose half of the remaining unstable nuclei. Aqa revision guide with online edition higher cgp gcse physics 91 revision by cgp books isbn. An isotope started with a radiation level of 1600 countssec, after 4 hours it had a radiation level of 400 countssec. Remember that halflife is the time taken to half, not the value of half the number. Gcse physics radioactivity 2 half life and background. In this cgse physics revision video, hazel takes you through some half life questions and talks you through how to answer them. The graph starts at 16 atoms and shows the number of parent nuclei halving every halflife.
Calculate age of old objects by radioactive dating. Frank close is a professor of physics at the university of oxford. Half life radioactive decay aqa gcse physics single. Discover delightful childrens books with prime book box, a subscription that. Radioactive decay is a spontaneous and random process. Radioactive isotopes are used for blood flow monitoring, cancer treatment, paper mills, carbon dating and smoke alarms. This website and its content is subject to our terms and conditions. Click here to refer the most useful books of physics.
Halflife gcse gorillaphysics gcse and a level physics. Written by the expert teachers at save my exams for the aqa 91 gcse physics exam. Some do it very slowly and half of the unstable nuclei take billions of years to decay. You can get the knowledge of useful books of physics here. Written by expert teachers for the cie igcse 91 0972 ag 0625 syllabus. If n is a large number, then many halflives not just two pass before all of the nuclei decay. After n half lives of a rate of disintegration of both are equal. Radioactivity and half life are concepts in science that can seem tricky. So if a sample starts at 300, and takes 50s to get to 150, the halflife is 50s not 150.
If you are asked to work out a time from activity data then the way around the problem is to work out how many halflives have passed, i. The term is commonly used in nuclear physics to describe how quickly. How radioactive decay works what activity means the two definitions of half life how to show radioactive decay on a graph how we can find the count rate with a geiger. In this video, we look at what is meant by the halflife of a. Questions on activity, decay equations, and half life.
Half life physics science get that c in your gcse and igcse duration. Gcse physics revision guide with online edition ag. Half life is the time it takes for half of the unstable nuclei in a sample to decay or for the activity of the sample to halve or for the count rate to halve. Worksheet radioactivity calculations teaching resources. Iii radioactive halflife igcse physics revision youtube. A longtime science writer, close is the author of many books, including the infinity puzzle, neutrino, nothing, the void, and the cosmic onion. Master the concepts of half life with the help of study material for iit jee by askiitians. Halflife and activity college physics bc open textbooks. Nuclear decay is an example of a purely statistical. Free physics revision notes on the topic radioactive decay. The half life of radioactive carbon14 is 5,730 years. All radioactive isotopes have a decay curve that looks like the one in the graph.
An explanation of how to solve halflife questions, aimed at gcselevel students. They then establish which type of decay occurs, and write a decay equation. Gcse physics revision guide with online edition ag cour parsons, richardm on. Bejan isnt the first person to study behavior as physics, or to use physics to. Half life radioactive decay aqa gcse physics single science. Gcse physics revision guide with online edition ag cour.
346 909 1151 367 205 85 80 1469 92 1160 883 699 1286 1184 581 1473 1298 385 252 72 118 794 1350 1284 271 78 1368 638 848 658 93 700 829 379 316 1253 88 1315 77 673 67 120 814 1018 1054 542 544 279 9 351