Practice: Atomic structure and radiation

OCR J249 — these questions are matched to your selected course.

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Question 1 · 1 mark · Foundation · Calculation · Single question

A sample's corrected count rate falls from 800 counts/s to 100 counts/s. How many half-lives have elapsed?

Question 2 · 1 mark · Foundation · Recall · Single question

Practice: Atomic structure and radiation

A sample's corrected count rate falls from 800 counts/s to 100 counts/s. How many half-lives have elapsed?

What is an alpha particle?