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Count-Rate - GCSE Physics Definition

Reviewed by: Philippa Platt

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In GCSE Physics, the term 'Count-Rate' refers to the number of ionising particles or radiation bursts detected by a Geiger-Müller tube or similar device in a given period of time, typically measured in counts per second (cps) or counts per minute (cpm).

It is a crucial concept when assessing levels of radioactivity, as it provides a quantitative measure of how much radiation is present in a particular area.

Understanding count-rate allows students to analyse the intensity of radioactive sources, compare different types of radiation, and apply safety measures accordingly. It forms part of the broader study of nuclear physics and helps in understanding how radiation interacts with matter.

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Philippa Platt

Reviewer: Philippa Platt

Expertise: Chemistry Content Creator

Philippa has worked as a GCSE and A level chemistry teacher and tutor for over thirteen years. She studied chemistry and sport science at Loughborough University graduating in 2007 having also completed her PGCE in science. Throughout her time as a teacher she was incharge of a boarding house for five years and coached many teams in a variety of sports. When not producing resources with the chemistry team, Philippa enjoys being active outside with her young family and is a very keen gardener

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