The question discussed in this Exam talkback explores ideas about conservation laws applied to fusion, fission and radioactivity. It also tests understanding of units, significant figures and mathematical reasoning, as well as quality of written communication about some of the most fundamental conservation concepts of physics.
It is taken from the June 2014 Edexcel Physics Unit 5 paper: Physics from Creation to Collapse, which covers thermal energy, nuclear decay, oscillations, astrophysics and cosmolog y. The question is reproduced by kind permission of Pearson Education Ltd (Edexcel). The answers that follow are the responsibility of PHYSICS REVIEW and Edexcel accepts no responsibility whatsoever for the accuracy or method of working in the answers given.
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