Uploaded April 2019 | Updated September 2026, 2 hours ago

---

Goes over four different worked examples for calculating activity and half-life from radioactive decay. Activity is defined as the number of decays per second. It is abbreviated with the symbol A and has the metric unit the Becquerel (Bq). One Becquerel is equal to one decay per second.

Social Media for Step by Step Science:
Teacher Pay Teachers Store: tinyurl.com/y6d2cdfj
Instagram: instagram.com/stepbystepscience101
Website: stepbystepscience.com
Blog: stepbystepscience.com/blog
Link Tree: https://linktr.ee/stepbystepscience

This video can be shared at youtu.be/HXFTZyBKWEg

Please support my channel by doing all of the following:
(1) Subscribe, get all my physics, chemistry and math videos.
(2) Give me a thumbs up for this video.
(3) Leave me a nice positive comment.
(4) Sharing is Caring, sharing this video with all of your friends.