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Nuclear and particle physics
Quick questions on Radioactivity: decay law, activity and half-life - Edexcel A-Level Physics
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is types of radiation?Show answer
The more ionising a radiation, the more rapidly it loses energy and the shorter its range. In magnetic and electric fields, alpha and beta deflect in opposite directions (opposite charges) and gamma is undeflected (no charge).
What is half-life?Show answer
After half-lives the activity is . Half-lives range from fractions of a second to billions of years, which is what makes some isotopes useful for dating and others for medical imaging.
What is q1?Show answer
State which type of radiation is the most ionising. [1 mark]
What is q2?Show answer
A source has a half-life of days and an initial activity of Bq. Find its activity after days. [2 marks]
What is q3?Show answer
A sample has decay constant per year. Find its half-life. [2 marks]
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